rp2/boards: Add Pimoroni Pico LiPo 16MB.

ports/rp2/boards/PIMORONI_PICOLIPO_16MB/mpconfigboard.cmake

+# cmake file for Pimoroni Pico LiPo 16MB

ports/rp2/boards/PIMORONI_PICOLIPO_16MB/mpconfigboard.h

+// https://shop.pimoroni.com/products/pimoroni-pico-lipo?variant=39335427080275
+
+#define MICROPY_HW_BOARD_NAME          "Pimoroni Pico LiPo 16MB"
+#define MICROPY_HW_FLASH_STORAGE_BYTES (7 * 1024 * 1024)
+
+#define MICROPY_HW_USB_VID (0x2E8A)
+#define MICROPY_HW_USB_PID (0x1003)
+
+#define MICROPY_HW_UART1_TX  (8)
+#define MICROPY_HW_UART1_RX  (9)
+#define MICROPY_HW_UART1_CTS (10)
+#define MICROPY_HW_UART1_RTS (11)
+
+// Qwiic on I2C0
+#define MICROPY_HW_I2C0_SCL  (4)
+#define MICROPY_HW_I2C0_SDA  (5)
+
+#define MICROPY_HW_SPI0_SCK  (18)
+#define MICROPY_HW_SPI0_MOSI (19)
+#define MICROPY_HW_SPI0_MISO (16)
+
+// User LED GPIO25
+
+// VBUS_SENSE GPIO24
+
+// BAT_SENSE GPIO29
+
+// Boot button GPIO23