📌 Overridable probe-related pins (#23107)

Marlin/src/pins/stm32f1/pins_BTT_SKR_CR6.h

 //
 // Probe
 //
-#define PROBE_TARE_PIN                      PA1
+#ifndef PROBE_TARE_PIN
+  #define PROBE_TARE_PIN                    PA1
+#endif
+
 #if ENABLED(PROBE_ACTIVATION_SWITCH)
-  #define PROBE_ACTIVATION_SWITCH_PIN       PC2   // Optoswitch to Enable Z Probe
+  #ifndef PROBE_ACTIVATION_SWITCH_PIN
+    #define PROBE_ACTIVATION_SWITCH_PIN     PC2   // Optoswitch to Enable Z Probe
+  #endif
 #endif
 
 //

Marlin/src/pins/stm32f1/pins_CREALITY_V452.h

 #define FAN_PIN                             PA0   // FAN
 
 #if ENABLED(PROBE_ACTIVATION_SWITCH)
-  #define PROBE_ACTIVATION_SWITCH_PIN       PC6   // Optoswitch to Enable Z Probe
+  #ifndef PROBE_ACTIVATION_SWITCH_PIN
+    #define PROBE_ACTIVATION_SWITCH_PIN     PC6   // Optoswitch to Enable Z Probe
+  #endif
 #endif
 
 #include "pins_CREALITY_V45x.h"

Marlin/src/pins/stm32f1/pins_CREALITY_V453.h

 #define FAN_PIN                             PB15  // FAN
 
 #if ENABLED(PROBE_ACTIVATION_SWITCH)
-  #define PROBE_ACTIVATION_SWITCH_PIN       PB2   // Optoswitch to Enable Z Probe
+  #ifndef PROBE_ACTIVATION_SWITCH_PIN
+    #define PROBE_ACTIVATION_SWITCH_PIN     PB2   // Optoswitch to Enable Z Probe
+  #endif
 #endif
 
 #include "pins_CREALITY_V45x.h"

Marlin/src/pins/stm32f1/pins_CREALITY_V45x.h

 //
 // Probe
 //
-#define PROBE_TARE_PIN                      PA5
+#ifndef PROBE_TARE_PIN
+  #define PROBE_TARE_PIN                    PA5
+#endif
 
 //
 // Steppers

Marlin/src/pins/stm32f4/pins_BTT_SKR_V2_0_common.h

 // Probe enable
 //
 #if ENABLED(PROBE_ENABLE_DISABLE)
-  #define PROBE_ENABLE_PIN            SERVO0_PIN
+  #ifndef PROBE_ENABLE_PIN
+    #define PROBE_ENABLE_PIN          SERVO0_PIN
+  #endif
 #endif
 
 //