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

tmk_core/common/avr/suspend_avr.h

@@ -1,5 +1,4 @@
-#ifndef SUSPEND_AVR_H
-#define SUSPEND_AVR_H
+#pragma once
 
 #include <stdint.h>
 #include <stdbool.h>
@@ -24,5 +23,3 @@ __asm__ __volatile__ (                      \
     : "r0"  \
 )
 // clang-format on
-
-#endif

tmk_core/common/avr/timer_avr.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 TIMER_AVR_H
-#define TIMER_AVR_H 1
+#pragma once
 
 #include <stdint.h>
 
@@ -38,5 +37,3 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #if (TIMER_RAW_TOP > 255)
 #    error "Timer0 can't count 1ms at this clock freq. Use larger prescaler."
 #endif
-
-#endif

tmk_core/common/avr/xprintf.h

@@ -2,8 +2,7 @@
    Extended itoa, puts and printf                    (C)ChaN, 2011
 -----------------------------------------------------------------------------*/
 
-#ifndef XPRINTF_H
-#define XPRINTF_H
+#pragma once
 
 #include <inttypes.h>
 #include <avr/pgmspace.h>
@@ -102,5 +101,3 @@ char xatoi(char **str, long *ret);
 #ifdef __cplusplus
 }
 #endif
-
-#endif