Fix servo count define conflict

`MAX_SERVOS` => `NUM_SERVO_PLUGS`

Marlin/src/inc/SanityCheck.h

@@ -756,7 +756,7 @@ static_assert(X_MAX_LENGTH >= X_BED_SIZE && Y_MAX_LENGTH >= Y_BED_SIZE,
 /**
  * Limited number of servos
  */
-#if NUM_SERVOS > MAX_SERVOS
+#if NUM_SERVOS > NUM_SERVO_PLUGS
   #error "The selected board doesn't support enough servos for your configuration. Reduce NUM_SERVOS."
 #endif
 

Marlin/src/module/configuration_store.cpp

@@ -181,7 +181,7 @@ typedef struct SettingsDataStruct {
   //
   // SERVO_ANGLES
   //
-  uint16_t servo_angles[MAX_SERVOS][2];                 // M281 P L U
+  uint16_t servo_angles[NUM_SERVO_PLUGS][2];                 // M281 P L U
 
   //
   // DELTA / [XYZ]_DUAL_ENDSTOPS
@@ -545,7 +545,7 @@ void MarlinSettings::postprocess() {
       #if ENABLED(SWITCHING_EXTRUDER)
         constexpr uint16_t sesa[][2] = SWITCHING_EXTRUDER_SERVO_ANGLES;
       #endif
-      constexpr uint16_t servo_angles[MAX_SERVOS][2] = {
+      constexpr uint16_t servo_angles[NUM_SERVO_PLUGS][2] = {
         #if ENABLED(SWITCHING_EXTRUDER)
           [SWITCHING_EXTRUDER_SERVO_NR] = { sesa[0], sesa[1] }
           #if EXTRUDERS > 3
@@ -1167,7 +1167,7 @@ void MarlinSettings::postprocess() {
       // SERVO_ANGLES
       //
       #if !HAS_SERVOS || DISABLED(EDITABLE_SERVO_ANGLES)
-        uint16_t servo_angles[MAX_SERVOS][2];
+        uint16_t servo_angles[NUM_SERVO_PLUGS][2];
       #endif
       EEPROM_READ(servo_angles);
 

Marlin/src/pins/pins.h

@@ -627,8 +627,8 @@
   #define MAX_EXTRUDERS 5
 #endif
 
-#ifndef MAX_SERVOS
-  #define MAX_SERVOS 4
+#ifndef NUM_SERVO_PLUGS
+  #define NUM_SERVO_PLUGS 4
 #endif
 
 //