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

tmk_core/protocol/next_kbd.h

@@ -45,13 +45,12 @@ POSSIBILITY OF SUCH DAMAGE.
 
 */
 
+#pragma once
+
 #include <stdbool.h>
 
-#ifndef NEXT_KBD_H
-#    define NEXT_KBD_H
-
-#    define NEXT_KBD_KMBUS_IDLE 0x300600
-#    define NEXT_KBD_TIMING 50
+#define NEXT_KBD_KMBUS_IDLE 0x300600
+#define NEXT_KBD_TIMING 50
 
 extern uint8_t next_kbd_error;
 
@@ -59,5 +58,3 @@ extern uint8_t next_kbd_error;
 void     next_kbd_init(void);
 void     next_kbd_set_leds(bool left, bool right);
 uint32_t next_kbd_recv(void);
-
-#endif