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

tmk_core/common/action_macro.h

@@ -14,8 +14,9 @@ GNU General Public License for more details.
 You should have received a copy of the GNU General Public License
 along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
-#ifndef ACTION_MACRO_H
-#define ACTION_MACRO_H
+
+#pragma once
+
 #include <stdint.h>
 #include "progmem.h"
 
@@ -120,5 +121,3 @@ enum macro_command_id {
 /* for backward comaptibility */
 #define MD(key) DOWN(KC_##key)
 #define MU(key) UP(KC_##key)
-
-#endif /* ACTION_MACRO_H */