stm32: Include HAL MMC code in F4 builds.

So that the MMC driver can be used on F4 MCUs.
Signed-off-by: Damien George <damien@micropython.org>

ports/stm32/Makefile

@@ -422,6 +422,11 @@ HAL_SRC_C += $(addprefix $(HAL_DIR)/Src/stm32$(MCU_SERIES)xx_,\
 	hal_dma_ex.c \
 	hal_dcmi.c \
 	)
+ifeq ($(MCU_SERIES),$(filter $(MCU_SERIES),f4))
+# HAL F4-1.16.0 has a bug with missing parentheses in HAL_MMC_Erase.
+# This function is unused so let the error go by as a warning.
+$(BUILD)/$(HAL_DIR)/Src/stm32$(MCU_SERIES)xx_hal_mmc.o: CFLAGS += -Wno-error=parentheses
+endif
 endif
 
 ifeq ($(CMSIS_MCU),$(filter $(CMSIS_MCU),STM32H743xx STM32H750xx STM32H7A3xx STM32H7A3xxQ STM32H7B3xx STM32H7B3xxQ))

ports/stm32/boards/stm32f4xx_hal_conf_base.h

@@ -42,6 +42,7 @@
 #include "stm32f4xx_hal_i2c.h"
 #include "stm32f4xx_hal_i2s.h"
 #include "stm32f4xx_hal_iwdg.h"
+#include "stm32f4xx_hal_mmc.h"
 #include "stm32f4xx_hal_pcd.h"
 #include "stm32f4xx_hal_pwr.h"
 #include "stm32f4xx_hal_rcc.h"
@@ -74,6 +75,7 @@
 #define HAL_I2C_MODULE_ENABLED
 #define HAL_I2S_MODULE_ENABLED
 #define HAL_IWDG_MODULE_ENABLED
+#define HAL_MMC_MODULE_ENABLED
 #define HAL_PCD_MODULE_ENABLED
 #define HAL_PWR_MODULE_ENABLED
 #define HAL_RCC_MODULE_ENABLED