Change keyboard level include guards to pragma once (#14248)

* Change keyboard level include guards to `pragma once`

And clean up a lot of layout macros

* Oops

* Remove dangling endif

tmk_core/protocol/usb_hid/parser.h

@@ -1,5 +1,4 @@
-#ifndef PARSER_H
-#define PARSER_H
+#pragma once
 
 #include "hid.h"
 #include "report.h"
@@ -11,5 +10,3 @@ public:
     uint16_t time_stamp;
     virtual void Parse(HID *hid, bool is_rpt_id, uint8_t len, uint8_t *buf);
 };
-
-#endif

tmk_core/protocol/usb_hid/usb_hid.h

@@ -1,10 +1,6 @@
-#ifndef USB_HID_H
-#define USB_HID_H
+#pragma once
 
 #include "report.h"
 
-
 extern report_keyboard_t usb_hid_keyboard_report;
 extern uint16_t usb_hid_time_stamp;
-
-#endif