Fix SKR 1.4 Turbo SD_DETECT_PIN (#16955)

Marlin/src/pins/lpc1768/pins_BTT_SKR_V1_4.h

 #define TEMP_BED_PIN       P0_25_A2   // A0 (T0) - (67) - TEMP_BED_PIN
 
 //
-// Include common SKR pins
-//
-#include "pins_BTT_SKR_common.h"
-
-//
 // Software SPI pins for TMC2130 stepper drivers
 //
 #if ENABLED(TMC_USE_SW_SPI)
     #define LCD_PINS_D4    P1_20
 
     #define LCD_SDSS       P0_16   // (16) J3-7 & AUX-4
-    #define SD_DETECT_PIN  P1_31   // (49) (NOT 5V tolerant)
+
+    #if SD_CONNECTION_IS(LCD)
+      #define SD_DETECT_PIN P1_31  // (49) (NOT 5V tolerant)
+    #endif
 
     #if ENABLED(FYSETC_MINI_12864)
       #define DOGLCD_CS    P1_18
  *   P0_27  (57) (Open collector)
  *   P0_28  (58) (Open collector)
  */
+
+//
+// Include common SKR pins
+//
+#include "pins_BTT_SKR_common.h"