rp2/boards: Add PYBSTICK26 RP2040 board definition.

ports/rp2/boards/GARATRONIC_PYBSTICK26_RP2040/board.json

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+{
+    "deploy": [
+        "../deploy.md"
+    ],
+    "docs": "",
+    "features": [
+        "USB Stick form factor",
+        "Breadboard Friendly",
+        "Reset/User button",
+        "Red/green/orange/blue leds",
+        "1MB SPI Flash",
+        "USB-A"
+    ],
+    "images": [
+        "pybstick-rp2040-26-broches-micropython-c.jpg"
+    ],
+    "mcu": "rp2040",
+    "product": "PYBSTICK26 RP2040",
+    "thumbnail": "",
+    "url": "https://shop.mchobby.be/product.php?id_product=2331",
+    "vendor": "McHobby"
+}

ports/rp2/boards/GARATRONIC_PYBSTICK26_RP2040/mpconfigboard.cmake

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+# cmake file

ports/rp2/boards/GARATRONIC_PYBSTICK26_RP2040/mpconfigboard.h

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+// Board and hardware specific configuration
+#define MICROPY_HW_BOARD_NAME                   "GARATRONIC_PYBSTICK26_RP2040"
+#define MICROPY_HW_FLASH_STORAGE_BYTES          (384 * 1024)