Add board definition for upcoming Pololu 3pi+ 2040 Robot

Author: Paul Grayson

src/boards/include/boards/pololu_3pi_2040_robot.h

@@ -0,0 +1,12 @@
+#pragma once
+
+// For board detection
+#define POLOLU_3PI_2040_ROBOT
+
+#define PICO_DEFAULT_LED_PIN 25
+#define PICO_BOOT_STAGE2_CHOOSE_W25Q080 1
+#define PICO_FLASH_SPI_CLKDIV 2
+#define PICO_FLASH_SIZE_BYTES (16 * 1024 * 1024)
+
+// All boards have at least the B1 revision
+#define PICO_RP2040_B0_SUPPORTED 0