Add probe_switch_activated

Marlin/src/module/endstops.cpp

     ES_REPORT(Z4_MAX);
   #endif
   #if BOTH(MARLIN_DEV_MODE, PROBE_ACTIVATION_SWITCH)
-    print_es_state(READ(PROBE_ACTIVATION_SWITCH_PIN) == PROBE_ACTIVATION_SWITCH_STATE, PSTR(STR_PROBE_EN));
+    print_es_state(probe_switch_activated(), PSTR(STR_PROBE_EN));
   #endif
   #if HAS_CUSTOM_PROBE_PIN
     print_es_state(PROBE_TRIGGERED(), PSTR(STR_Z_PROBE));
 
   #if HAS_BED_PROBE
     // When closing the gap check the enabled probe
-    if (true
-      #if ENABLED(PROBE_ACTIVATION_SWITCH)
-        || READ(PROBE_ACTIVATION_SWITCH_PIN) == PROBE_ACTIVATION_SWITCH_STATE
-      #endif
-    ) UPDATE_ENDSTOP_BIT(Z, TERN(HAS_CUSTOM_PROBE_PIN, MIN_PROBE, MIN));
+    if (probe_switch_activated())
+      UPDATE_ENDSTOP_BIT(Z, TERN(HAS_CUSTOM_PROBE_PIN, MIN_PROBE, MIN));
   #endif
 
   #if HAS_Z_MAX && !Z_SPI_SENSORLESS

Marlin/src/module/endstops.h

       ;
     }
 
+    static inline bool probe_switch_activated() {
+      return (true
+        #if ENABLED(PROBE_ACTIVATION_SWITCH)
+          && READ(PROBE_ACTIVATION_SWITCH_PIN) == PROBE_ACTIVATION_SWITCH_STATE
+        #endif
+      );
+    }
+
     /**
      * Report endstop hits to serial. Called from loop().
      */

Marlin/src/module/probe.cpp

    */
   bool Probe::tare() {
     #if BOTH(PROBE_ACTIVATION_SWITCH, PROBE_TARE_ONLY_WHILE_INACTIVE)
-      if (READ(PROBE_ACTIVATION_SWITCH_PIN) == PROBE_ACTIVATION_SWITCH_STATE) {
+      if (endstops.probe_switch_activated()) {
         SERIAL_ECHOLNPGM("Cannot tare an active probe");
         return true;
       }

buildroot/tests/STM32F103RET6_creality-tests

 opt_set MOTHERBOARD BOARD_CREALITY_V452
 opt_disable NOZZLE_TO_PROBE_OFFSET
 opt_enable NOZZLE_AS_PROBE Z_SAFE_HOMING Z_MIN_PROBE_USES_Z_MIN_ENDSTOP_PIN
-opt_enable PROBE_ACTIVATION_SWITCH PROBE_ACTIVATION_SWITCH_PIN PROBE_TARE PROBE_TARE_ONLY_WHILE_INACTIVE
+opt_enable PROBE_ACTIVATION_SWITCH PROBE_TARE PROBE_TARE_ONLY_WHILE_INACTIVE
 exec_test $1 $2 "Creality V4.5.2 PROBE_ACTIVATION_SWITCH, Probe Tare" "$3"
 
 # clean up