stm32/boards: Split UARTx_RTS_DE into UARTx_RTS/UARTx_DE in pin defs.

So these alternate functions can be parsed by the build scripts and used in
application code.
Signed-off-by: Damien George <damien@micropython.org>

ports/stm32/boards/stm32l072_af.csv

 Port,Pin,AF0,AF1,AF2,AF3,AF4,AF5,AF6,AF7,,
 ,,SPI1/SPI2/I2S2/USART1/2/LPUART1/USB/LPTIM1/TSC/TIM2/21/22/EVENTOUT/SYS_AF,SPI1/SPI2/I2S2/I2C1/TIM2/21,SPI1/SPI2/I2S2/LPUART1/USART5/USB/LPTIM1/TIM2/3/EVENTOUT/SYS_AF,I2C1/TSC/EVENTOUT,I2C1/USART1/2/LPUART1/TIM3/22/EVENTOUT,SPI2/I2S2/I2C2/USART1/TIM2/21/22,I2C1/2/LPUART1/USART4/UASRT5/TIM21/EVENTOUT,I2C3/LPUART1/COMP1/2/TIM3,,ADC
 PortA,PA0,,,TIM2_CH1,TSC_G1_IO1,USART2_CTS,TIM2_ETR,USART4_TX,COMP1_OUT,,ADC_IN0
-PortA,PA1,EVENTOUT,,TIM2_CH2,TSC_G1_IO2,USART2_RTS_DE,TIM21_ETR,USART4_RX,,,ADC_IN1
+PortA,PA1,EVENTOUT,,TIM2_CH2,TSC_G1_IO2,USART2_RTS/USART2_DE,TIM21_ETR,USART4_RX,,,ADC_IN1
 PortA,PA2,TIM21_CH1,,TIM2_CH3,TSC_G1_IO3,USART2_TX,,LPUART1_TX,COMP2_OUT,,ADC_IN2
 PortA,PA3,TIM21_CH2,,TIM2_CH4,TSC_G1_IO4,USART2_RX,,LPUART1_RX,,,ADC_IN3
 PortA,PA4,SPI1_NSS,,,TSC_G2_IO1,USART2_CK,TIM22_ETR,,,,ADC_IN4
@@ -12,25 +12,25 @@ PortA,PA8,MCO,,USB_CRS_SYNC,EVENTOUT,USART1_CK,,,I2C3_SCL,,
 PortA,PA9,MCO,,,TSC_G4_IO1,USART1_TX,,I2C1_SCL,I2C3_SMBA,,
 PortA,PA10,,,,TSC_G4_IO2,USART1_RX,,I2C1_SDA,,,
 PortA,PA11,SPI1_MISO,,EVENTOUT,TSC_G4_IO3,USART1_CTS,,,COMP1_OUT,,
-PortA,PA12,SPI1_MOSI,,EVENTOUT,TSC_G4_IO4,USART1_RTS_DE,,,COMP2_OUT,,
+PortA,PA12,SPI1_MOSI,,EVENTOUT,TSC_G4_IO4,USART1_RTS/USART1_DE,,,COMP2_OUT,,
 PortA,PA13,SWDIO,,USB_NOE,,,,LPUART1_RX,,,
 PortA,PA14,SWCLK,,,,USART2_TX,,LPUART1_TX,,,
-PortA,PA15,SPI1_NSS,,TIM2_ETR,EVENTOUT,USART2_RX,TIM2_CH1,USART4_RTS_DE,,,
+PortA,PA15,SPI1_NSS,,TIM2_ETR,EVENTOUT,USART2_RX,TIM2_CH1,USART4_RTS/USART4_DE,,,
 PortB,PB0,EVENTOUT,,TIM3_CH3,TSC_G3_IO2,,,,,,ADC_IN8
-PortB,PB1,,,TIM3_CH4,TSC_G3_IO3,LPUART1_RTS_DE,,,,,ADC_IN9
+PortB,PB1,,,TIM3_CH4,TSC_G3_IO3,LPUART1_RTS/LPUART1_DE,,,,,ADC_IN9
 PortB,PB2,,,LPTIM1_OUT,TSC_G3_IO4,,,,I2C3_SMBA,,
-PortB,PB3,SPI1_SCK,,TIM2_CH2,TSC_G5_IO1,EVENTOUT,USART1_RTS_DE,USART5_TX,,,
+PortB,PB3,SPI1_SCK,,TIM2_CH2,TSC_G5_IO1,EVENTOUT,USART1_RTS/USART1_DE,USART5_TX,,,
 PortB,PB4,SPI1_MISO,,TIM3_CH1,TSC_G5_IO2,TIM22_CH1,USART1_CTS,USART5_RX,I2C3_SDA,,
-PortB,PB5,SPI1_MOSI,,LPTIM1_IN1,I2C1_SMBA,TIM3_CH2/TIM22_CH2,USART1_CK,USART5_CK/USART5_RTS_DE,,,
+PortB,PB5,SPI1_MOSI,,LPTIM1_IN1,I2C1_SMBA,TIM3_CH2/TIM22_CH2,USART1_CK,USART5_CK/USART5_RTS/USART5_DE,,,
 PortB,PB6,USART1_TX,I2C1_SCL,LPTIM1_ETR,TSC_G5_IO3,,,,,,
 PortB,PB7,USART1_RX,I2C1_SDA,LPTIM1_IN2,TSC_G5_IO4,,,USART4_CTS,,,
 PortB,PB8,,,,TSC_SYNC,I2C1_SCL,,,,,
 PortB,PB9,,,EVENTOUT,,I2C1_SDA,SPI2_NSS/I2S2_WS,,,,
 PortB,PB10,,,TIM2_CH3,TSC_SYNC,LPUART1_TX,SPI2_SCK,I2C2_SCL,LPUART1_RX,,
 PortB,PB11,EVENTOUT,,TIM2_CH4,TSC_G6_IO1,LPUART1_RX,,I2C2_SDA,LPUART1_TX,,
-PortB,PB12,SPI2_NSS/I2S2_WS,,LPUART1_RTS_DE,TSC_G6_IO2,I2C2_SMBA,,EVENTOUT,,,
+PortB,PB12,SPI2_NSS/I2S2_WS,,LPUART1_RTS/LPUART1_DE,TSC_G6_IO2,I2C2_SMBA,,EVENTOUT,,,
 PortB,PB13,SPI2_SCK/I2S2_CK,,MCO,TSC_G6_IO3,LPUART1_CTS,I2C2_SCL,TIM21_CH1,,,
-PortB,PB14,SPI2_MISO/I2S2_MCK,,RTC_OUT,TSC_G6_IO4,LPUART1_RTS_DE,I2C2_SDA,TIM21_CH2,,,
+PortB,PB14,SPI2_MISO/I2S2_MCK,,RTC_OUT,TSC_G6_IO4,LPUART1_RTS/LPUART1_DE,I2C2_SDA,TIM21_CH2,,,
 PortB,PB15,SPI2_MOSI/I2S2_SD,,RTC_REFIN,,,,,,,
 PortC,PC0,LPTIM1_IN1,,EVENTOUT,TSC_G7_IO1,,,LPUART1_RX,I2C3_SCL,,ADC_IN10
 PortC,PC1,LPTIM1_OUT,,EVENTOUT,TSC_G7_IO2,,,LPUART1_TX,I2C3_SDA,,ADC_IN11
@@ -50,9 +50,9 @@ PortC,PC14,,,,,,,,,,
 PortC,PC15,,,,,,,,,,
 PortD,PD0,TIM21_CH1,SPI2_NSS/I2S2_WS,,,,,,,,
 PortD,PD1,,SPI2_SCK/I2S2_CK,,,,,,,,
-PortD,PD2,LPUART1_RTS_DE,,TIM3_ETR,,,,USART5_RX,,,
+PortD,PD2,LPUART1_RTS/LPUART1_DE,,TIM3_ETR,,,,USART5_RX,,,
 PortD,PD3,USART2_CTS,,SPI2_MISO/I2S2_MCK,,,,,,,
-PortD,PD4,USART2_RTS_DE,SPI2_MOSI/I2S2_SD,,,,,,,,
+PortD,PD4,USART2_RTS/USART2_DE,SPI2_MOSI/I2S2_SD,,,,,,,,
 PortD,PD5,USART2_TX,,,,,,,,,
 PortD,PD6,USART2_RX,,,,,,,,,
 PortD,PD7,USART2_CK,TIM21_CH2,,,,,,,,
@@ -60,7 +60,7 @@ PortD,PD8,LPUART1_TX,,,,,,,,,
 PortD,PD9,LPUART1_RX,,,,,,,,,
 PortD,PD10,,,,,,,,,,
 PortD,PD11,LPUART1_CTS,,,,,,,,,
-PortD,PD12,LPUART1_RTS_DE,,,,,,,,,
+PortD,PD12,LPUART1_RTS/LPUART1_DE,,,,,,,,,
 PortD,PD13,,,,,,,,,,
 PortD,PD14,,,,,,,,,,
 PortD,PD15,USB_CRS_SYNC,,,,,,,,,
@@ -71,7 +71,7 @@ PortE,PE3,TIM22_CH1,,TIM3_CH1,,,,,,,
 PortE,PE4,TIM22_CH2,,TIM3_CH2,,,,,,,
 PortE,PE5,TIM21_CH1,,TIM3_CH3,,,,,,,
 PortE,PE6,TIM21_CH2,,TIM3_CH4,,,,,,,
-PortE,PE7,,,,,,,USART5_CK/USART5_RTS_DE,,,
+PortE,PE7,,,,,,,USART5_CK/USART5_RTS/USART5_DE,,,
 PortE,PE8,,,,,,,USART4_TX,,,
 PortE,PE9,TIM2_CH1,,TIM2_ETR,,,,USART4_RX,,,
 PortE,PE10,TIM2_CH2,,,,,,USART5_TX,,,

ports/stm32/boards/stm32l452_af.csv

@@ -30,7 +30,7 @@ PortB,PB10,,TIM2_CH3,,I2C4_SCL,I2C2_SCL,SPI2_SCK,,USART3_TX,LPUART1_RX,TSC_SYNC,
 PortB,PB11,,TIM2_CH4,,I2C4_SDA,I2C2_SDA,,,USART3_RX,LPUART1_TX,,QUADSPI_NCS,,COMP2_OUT,,,EVENTOUT,,,
 PortB,PB12,,TIM1_BKIN,,TIM1_BKIN_COMP2,I2C2_SMBA,SPI2_NSS,DFSDM_DATIN1,USART3_CK,LPUART1_RTS/LPUART1_DE,TSC_G1_IO1,CAN1_RX,,,SAI1_FS_A,TIM15_BKIN,EVENTOUT,,,
 PortB,PB13,,TIM1_CH1N,,,I2C2_SCL,SPI2_SCK,DFSDM_CKIN1,USART3_CTS,LPUART1_CTS,TSC_G1_IO2,CAN1_TX,,,SAI1_SCK_A,TIM15_CH1N,EVENTOUT,,,
-PortB,PB14,,TIM1_CH2N,,,I2C2_SDA,SPI2_MISO,DFSDM_DATIN2,USART3_RTS_DE,,TSC_G1_IO3,,,,SAI1_MCLK_A,TIM15_CH1,EVENTOUT,,,
+PortB,PB14,,TIM1_CH2N,,,I2C2_SDA,SPI2_MISO,DFSDM_DATIN2,USART3_RTS/USART3_DE,,TSC_G1_IO3,,,,SAI1_MCLK_A,TIM15_CH1,EVENTOUT,,,
 PortB,PB15,RTC_REFIN,TIM1_CH3N,,,,SPI2_MOSI,DFSDM_CKIN2,,,TSC_G1_IO4,,,,SAI1_SD_A,TIM15_CH2,EVENTOUT,,,
 PortC,PC0,,LPTIM1_IN1,I2C4_SCL,,I2C3_SCL,,,,LPUART1_RX,,,,,,LPTIM2_IN1,EVENTOUT,ADC123_IN1,,
 PortC,PC1,TRACED0,LPTIM1_OUT,I2C4_SDA,,I2C3_SDA,,,,LPUART1_TX,,,,,,,EVENTOUT,ADC123_IN2,,

ports/stm32/boards/stm32l476_af.csv

@@ -30,7 +30,7 @@ PortB,PB10,,TIM2_CH3,,,I2C2_SCL,SPI2_SCK,DFSDM_DATIN7,USART3_TX,LPUART1_RX,,QUAD
 PortB,PB11,,TIM2_CH4,,,I2C2_SDA,,DFSDM_CKIN7,USART3_RX,LPUART1_TX,,QUADSPI_NCS,LCD_SEG11,COMP2_OUT,,,EVENTOUT,,
 PortB,PB12,,TIM1_BKIN,,TIM1_BKIN_COMP2,I2C2_SMBA,SPI2_NSS,DFSDM_DATIN1,USART3_CK,LPUART1_RTS/LPUART1_DE,TSC_G1_IO1,,LCD_SEG12,SWPMI1_IO,SAI2_FS_A,TIM15_BKIN,EVENTOUT,,
 PortB,PB13,,TIM1_CH1N,,,I2C2_SCL,SPI2_SCK,DFSDM_CKIN1,USART3_CTS,LPUART1_CTS,TSC_G1_IO2,,LCD_SEG13,SWPMI1_TX,SAI2_SCK_A,TIM15_CH1N,EVENTOUT,,
-PortB,PB14,,TIM1_CH2N,,TIM8_CH2N,I2C2_SDA,SPI2_MISO,DFSDM_DATIN2,USART3_RTS_DE,,TSC_G1_IO3,,LCD_SEG14,SWPMI1_RX,SAI2_MCLK_A,TIM15_CH1,EVENTOUT,,
+PortB,PB14,,TIM1_CH2N,,TIM8_CH2N,I2C2_SDA,SPI2_MISO,DFSDM_DATIN2,USART3_RTS/USART3_DE,,TSC_G1_IO3,,LCD_SEG14,SWPMI1_RX,SAI2_MCLK_A,TIM15_CH1,EVENTOUT,,
 PortB,PB15,RTC_REFIN,TIM1_CH3N,,TIM8_CH3N,,SPI2_MOSI,DFSDM_CKIN2,,,TSC_G1_IO4,,LCD_SEG15,SWPMI1_SUSPEND,SAI2_SD_A,TIM15_CH2,EVENTOUT,,
 PortC,PC0,,LPTIM1_IN1,,,I2C3_SCL,,DFSDM_DATIN4,,LPUART1_RX,,,LCD_SEG18,,,LPTIM2_IN1,EVENTOUT,ADC123_IN1,
 PortC,PC1,,LPTIM1_OUT,,,I2C3_SDA,,DFSDM_CKIN4,,LPUART1_TX,,,LCD_SEG19,,,,EVENTOUT,ADC123_IN2,

ports/stm32/boards/stm32wb55_af.csv

@@ -12,14 +12,14 @@ PortA,PA8,MCO,TIM1_CH1,,SAI1_PDM_CK2,,,,USART1_CK,,,,LCD_COM0,,SAI1_SCK_A,LPTIM2
 PortA,PA9,,TIM1_CH2,,SAI1_PDM_DI2,I2C1_SCL,SPI2_SCK,,USART1_TX,,,,LCD_COM1,,SAI1_FS_A,,EVENTOUT,ADC1_IN16
 PortA,PA10,,TIM1_CH3,,SAI1_PDM_DI1,I2C1_SDA,,,USART1_RX,,,USB_CRS_SYNC,LCD_COM2,,SAI1_SD_A,TIM17_BKIN,EVENTOUT,
 PortA,PA11,,TIM1_CH4,TIM1_BKIN2,,,SPI1_MISO,,USART1_CTS,,,USB_DM,,TIM1_BKIN2,,,EVENTOUT,
-PortA,PA12,,TIM1_ETR,,,,SPI1_MOSI,,USART1_RTS_DE,LPUART1_RX,,USB_DP,,,,,EVENTOUT,
+PortA,PA12,,TIM1_ETR,,,,SPI1_MOSI,,USART1_RTS/USART1_DE,LPUART1_RX,,USB_DP,,,,,EVENTOUT,
 PortA,PA13,JTMS/SWDIO,,,,,,,,IR_OUT,,USB_NOE,,,SAI1_SD_B,,EVENTOUT,
 PortA,PA14,JTCK/SWCLK,LPTIM1_OUT,,,I2C1_SMBA,,,,,,,LCD_SEG5,,SAI1_FS_B,,EVENTOUT,
 PortA,PA15,JTDI,TIM2_CH1,TIM2_ETR,,,SPI1_NSS,,,,TSC_G3_IO1,,LCD_SEG17,,,,EVENTOUT,
 PortB,PB0,,,,,,,EXT_PA_TX,,,,,,COMP1_OUT,,,EVENTOUT,
-PortB,PB1,,,,,,,,,LPUART1_RTS_DE,,,,,,LPTIM2_IN1,EVENTOUT,
+PortB,PB1,,,,,,,,,LPUART1_RTS/LPUART1_DE,,,,,,LPTIM2_IN1,EVENTOUT,
 PortB,PB2,RTC_OUT,LPTIM1_OUT,,,I2C3_SMBA,SPI1_NSS,,,,,,LCD_VLCD,,SAI1_EXTCLK,,EVENTOUT,
-PortB,PB3,JTDO/TRACESWO,TIM2_CH2,,,,SPI1_SCK,,USART1_RTS_DE,,,,LCD_SEG7,,SAI1_SCK_B,,EVENTOUT,
+PortB,PB3,JTDO/TRACESWO,TIM2_CH2,,,,SPI1_SCK,,USART1_RTS/USART1_DE,,,,LCD_SEG7,,SAI1_SCK_B,,EVENTOUT,
 PortB,PB4,NJTRST,,,,I2C3_SDA,SPI1_MISO,,USART1_CTS,,TSC_G2_IO1,,LCD_SEG8,,SAI1_MCLK_B,TIM17_BKIN,EVENTOUT,
 PortB,PB5,,LPTIM1_IN1,,,I2C1_SMBA,SPI1_MOSI,,USART1_CK,LPUART1_TX,TSC_G2_IO2,,LCD_SEG9,COMP2_OUT,SAI1_SD_B,TIM16_BKIN,EVENTOUT,
 PortB,PB6,MCO,LPTIM1_ETR,,,I2C1_SCL,,,USART1_TX,,TSC_G2_IO3,,LCD_SEG6,,SAI1_FS_B,TIM16_CH1N,EVENTOUT,