[2.0.x] Enable / disable PSU automatically (#9503)

Marlin/src/Marlin.cpp

@@ -236,9 +236,9 @@ void setup_powerhold() {
   #endif
   #if HAS_POWER_SWITCH
     #if ENABLED(PS_DEFAULT_OFF)
-      OUT_WRITE(PS_ON_PIN, PS_ON_ASLEEP);
+      PSU_OFF();
     #else
-      OUT_WRITE(PS_ON_PIN, PS_ON_AWAKE);
+      PSU_ON();
     #endif
   #endif
 }