Change include guards in tmk_core/ and drivers/ to pragma once (#11240)

tmk_core/protocol/midi/midi_device.h

@@ -21,8 +21,7 @@
  * @brief Device implementation functions
  */
 
-#ifndef MIDI_DEVICE_H
-#define MIDI_DEVICE_H
+#pragma once
 
 #ifdef __cplusplus
 extern "C" {
@@ -147,5 +146,3 @@ void midi_device_set_pre_input_process_func(MidiDevice* device, midi_no_byte_fun
 #ifdef __cplusplus
 }
 #endif
-
-#endif