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

tmk_core/protocol/ps2_mouse.h

@@ -15,8 +15,7 @@ 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 PS2_MOUSE_H
-#define PS2_MOUSE_H
+#pragma once
 
 #include <stdbool.h>
 #include "debug.h"
@@ -176,5 +175,3 @@ void ps2_mouse_set_resolution(ps2_mouse_resolution_t resolution);
 void ps2_mouse_set_sample_rate(ps2_mouse_sample_rate_t sample_rate);
 
 void ps2_mouse_moved_user(report_mouse_t *mouse_report);
-
-#endif