rp2/boards/SEEED_XIAO_RP2350: Add new Seeed XIAO board definition.

Signed-off-by: Lesords <2385342343@qq.com>

ports/rp2/boards/SEEED_XIAO_RP2350/board.json

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+{
+    "deploy": [
+        "../deploy.md"
+    ],
+    "docs": "",
+    "features": [
+        "Battery Charging",
+        "Dual-core",
+        "External Flash",
+        "RGB LED",
+        "USB"
+    ],
+    "images": [
+        "xiao_rp2350-font.jpg"
+    ],
+    "mcu": "rp2350",
+    "product": "XIAO RP2350",
+    "thumbnail": "",
+    "url": "https://www.seeedstudio.com/Seeed-XIAO-RP2350-p-5944.html",
+    "variants": {
+        "RISCV": "RISC-V CPU mode"
+    },
+    "vendor": "Seeed Studio"
+}

ports/rp2/boards/SEEED_XIAO_RP2350/mpconfigboard.cmake

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+# cmake file for Seeed XIAO RP2350
+set(PICO_BOARD "seeed_xiao_rp2350")
+
+# To change the gpio count for QFN-80
+# set(PICO_NUM_GPIOS 48)

ports/rp2/boards/SEEED_XIAO_RP2350/mpconfigboard.h

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+// Board and hardware specific configuration
+#define MICROPY_HW_BOARD_NAME                   "Seeed XIAO RP2350"
+#define MICROPY_HW_FLASH_STORAGE_BYTES          (PICO_FLASH_SIZE_BYTES - 1024 * 1024)

ports/rp2/boards/SEEED_XIAO_RP2350/mpconfigvariant.cmake

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+set(PICO_PLATFORM "rp2350")

ports/rp2/boards/SEEED_XIAO_RP2350/mpconfigvariant_RISCV.cmake

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+set(PICO_PLATFORM "rp2350-riscv")

ports/rp2/boards/SEEED_XIAO_RP2350/pins.csv

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+D0,GPIO26
+D1,GPIO27
+D2,GPIO28
+D3,GPIO5
+D4,GPIO6
+D5,GPIO7
+D6,GPIO0
+D7,GPIO1
+D8,GPIO2
+D9,GPIO4
+D10,GPIO3
+D11,GPIO21
+D12,GPIO20
+D13,GPIO17
+D14,GPIO16
+D15,GPIO11
+D16,GPIO12
+D17,GPIO10
+D18,GPIO9
+LED,GPIO25
+NEOPIXEL_POWER,GPIO23
+NEOPIXEL,GPIO22
+BAT_ADC_EN,GPIO19
+BAT_ADC,GPIO29