Add "#define PICO_RP2350B 1" since this board is based on RP2350B (#2445)

Author: SamHalvoe

variants/pimoroni_pico_plus_2/pins_arduino.h

@@ -49,6 +49,8 @@
 #define RP2350_PSRAM_CS         (47u)
 #define RP2350_PSRAM_MAX_SCK_HZ (109*1000*1000)
 
+#define PICO_RP2350B 1
+
 /* Pins mappings for marked pins on the board */
 static const uint8_t D0 = (0u);
 static const uint8_t D1 = (1u);
@@ -74,10 +76,15 @@ static const uint8_t D20 = (20u);
 static const uint8_t D21 = (21u);
 static const uint8_t D22 = (22u);
 
-static const uint8_t A0 = (26u);
-static const uint8_t A1 = (27u);
-static const uint8_t A2 = (28u);
-static const uint8_t A3 = (22u);
+static const uint8_t D26 = (40u);
+static const uint8_t D27 = (41u);
+static const uint8_t D28 = (42u);
+
+static const uint8_t A0 = (40u);
+static const uint8_t A1 = (41u);
+static const uint8_t A2 = (42u);
+
+static const uint8_t A3 = (43u);
 
 static const uint8_t SS = PIN_SPI0_SS;
 static const uint8_t MOSI = PIN_SPI0_MOSI;