🩹 RP2040 has PIN_SPI_SS

Followup to #27650

Author: thinkyhead

Marlin/src/HAL/RP2040/spi_pins.h

@@ -24,8 +24,6 @@
 /**
  * Define SPI Pins: SCK, MISO, MOSI, SS
  */
-#define PIN_SPI_SS 2
-
 #ifndef SD_SCK_PIN
   #define SD_SCK_PIN  PIN_SPI_SCK
 #endif
@@ -35,3 +33,6 @@
 #ifndef SD_MOSI_PIN
   #define SD_MOSI_PIN PIN_SPI_MOSI
 #endif
+#ifndef SD_SS_PIN
+  #define SD_SS_PIN   PIN_SPI_SS
+#endif