🩹 Fix Maple HAL compile errors (#23685)

Marlin/src/HAL/STM32F1/onboard_sd.cpp

@@ -38,8 +38,13 @@
   #define SPI_CLOCK_MAX SPI_BAUD_PCLK_DIV_2
 #endif
 
-#define CS_LOW()  WRITE(ONBOARD_SD_CS_PIN, LOW)  // Set OnboardSPI cs low
-#define CS_HIGH() WRITE(ONBOARD_SD_CS_PIN, HIGH) // Set OnboardSPI cs high
+#if PIN_EXISTS(ONBOARD_SD_CS) && ONBOARD_SD_CS_PIN != SD_SS_PIN
+  #define CS_LOW()  WRITE(ONBOARD_SD_CS_PIN, LOW)  // Set OnboardSPI cs low
+  #define CS_HIGH() WRITE(ONBOARD_SD_CS_PIN, HIGH) // Set OnboardSPI cs high
+#else
+  #define CS_LOW()
+  #define CS_HIGH()
+#endif
 
 #define FCLK_FAST() ONBOARD_SD_SPI.setClockDivider(SPI_CLOCK_MAX)
 #define FCLK_SLOW() ONBOARD_SD_SPI.setClockDivider(SPI_BAUD_PCLK_DIV_256)