Add HAS_FAN and others

Marlin/src/gcode/control/M42.cpp

@@ -24,7 +24,7 @@
 #include "../../MarlinCore.h" // for pin_is_protected
 #include "../../inc/MarlinConfig.h"
 
-#if FAN_COUNT > 0
+#if HAS_FAN
   #include "../../module/temperature.h"
 #endif
 
@@ -64,7 +64,7 @@ void GcodeSuite::M42() {
   if (!parser.seenval('S')) return;
   const byte pin_status = parser.value_byte();
 
-  #if FAN_COUNT > 0
+  #if HAS_FAN
     switch (pin) {
       #if HAS_FAN0
         case FAN0_PIN: thermalManager.fan_speed[0] = pin_status; return;

Marlin/src/gcode/control/M80_M81.cpp

@@ -92,7 +92,7 @@ void GcodeSuite::M81() {
   print_job_timer.stop();
   planner.finish_and_disable();
 
-  #if FAN_COUNT > 0
+  #if HAS_FAN
     thermalManager.zero_fan_speeds();
     #if ENABLED(PROBING_FANS_OFF)
       thermalManager.fans_paused = false;