rp2/boards/SEEED_XIAO_RP2040: Add XIAO RP2040 board definition.

Signed-off-by: Matt Trentini <matt.trentini@gmail.com>

Author: mattytrentini

ports/rp2/boards/SEEED_XIAO_RP2040/board.json

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+{
+    "deploy": [
+        "../deploy.md"
+    ],
+    "docs": "",
+    "features": [
+        "Dual-core",
+        "External Flash",
+        "RGB LED",
+        "USB",
+        "USB-C"
+    ],
+    "images": [
+        "seeedstudio_xiao_rp2040.jpg"
+    ],
+    "mcu": "rp2040",
+    "product": "XIAO RP2040",
+    "url": "https://www.seeedstudio.com/XIAO-RP2040-v1-0-p-5026.html",
+    "vendor": "Seeed Studio"
+}

ports/rp2/boards/SEEED_XIAO_RP2040/mpconfigboard.cmake

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+# cmake file for Seeed Studio XIAO RP204
+
+set(PICO_BOARD "seeed_xiao_rp2040")

ports/rp2/boards/SEEED_XIAO_RP2040/mpconfigboard.h

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+// https://wiki.seeedstudio.com/XIAO-RP2040/
+
+#define MICROPY_HW_BOARD_NAME          "Seeed Studio XIAO RP2040"
+#define MICROPY_HW_FLASH_STORAGE_BYTES (1408 * 1024)
+
+// No VID/PID defined for the Seeed XIAO RP2040
+// #define MICROPY_HW_USB_VID (0x)
+// #define MICROPY_HW_USB_PID (0x)
+
+// I2C0
+#define MICROPY_HW_I2C0_SCL  (7)
+#define MICROPY_HW_I2C0_SDA  (6)
+
+// SPI0
+#define MICROPY_HW_SPI0_SCK  (2)
+#define MICROPY_HW_SPI0_MOSI (3)
+#define MICROPY_HW_SPI0_MISO (4)
+
+// UART0 is, by default, assigned the correct pins (TX=0, RX=1)

ports/rp2/boards/SEEED_XIAO_RP2040/pins.csv

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+D0,GPIO26
+D1,GPIO27
+D2,GPIO28
+D3,GPIO29
+D4,GPIO6
+D5,GPIO7
+D6,GPIO0
+D7,GPIO1
+D8,GPIO2
+D9,GPIO4
+D10,GPIO3
+A0,GPIO26
+A1,GPIO27
+A2,GPIO28
+A3,GPIO29
+NEOPIXEL_POWER,GPIO11
+NEOPIXEL,GPIO12
+LED_R,GPIO17
+LED_G,GPIO16
+LED_B,GPIO25
+LED,GPIO25