rp2/boards: Add Adafruit QT Py RP2040.

ports/rp2/boards/ADAFRUIT_QTPY_RP2040/mpconfigboard.cmake

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+# cmake file for Adafruit QT Py RP2040

ports/rp2/boards/ADAFRUIT_QTPY_RP2040/mpconfigboard.h

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+// https://www.adafruit.com/product/4900
+// https://learn.adafruit.com/adafruit-qt-py-2040/pinouts
+
+#define MICROPY_HW_BOARD_NAME          "Adafruit QT Py RP2040"
+#define MICROPY_HW_FLASH_STORAGE_BYTES (7 * 1024 * 1024)
+
+#define MICROPY_HW_USB_VID (0x239A)
+#define MICROPY_HW_USB_PID (0x80F8)
+
+#define MICROPY_HW_UART1_TX  (20)
+#define MICROPY_HW_UART1_RX  (5)
+#define MICROPY_HW_UART1_CTS (10)
+#define MICROPY_HW_UART1_RTS (7)
+
+#define MICROPY_HW_I2C0_SCL  (25)
+#define MICROPY_HW_I2C0_SDA  (24)
+
+// STEMMA QT / Qwiic on I2C1
+#define MICROPY_HW_I2C1_SCL  (23)
+#define MICROPY_HW_I2C1_SDA  (22)
+
+#define MICROPY_HW_SPI0_SCK  (6)
+#define MICROPY_HW_SPI0_MOSI (3)
+#define MICROPY_HW_SPI0_MISO (4)
+
+// NeoPixel data GPIO12, power GPIO11
+
+// Boot button GPIO21