Add some missing #pragma onces (#19902)

keyboards/keychron/common/keychron_common.h

@@ -14,6 +14,8 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+#pragma once
+
 #include "stdint.h"
 #ifdef VIA_ENABLE
 #    include "via.h"

keyboards/keychron/v3/mcuconf.h

@@ -14,6 +14,8 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+#pragma once
+
 #include_next <mcuconf.h>
 
 #undef STM32_I2C_USE_I2C1

keyboards/keychron/v5/halconf.h

@@ -14,6 +14,8 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+#pragma once
+
 #define HAL_USE_I2C TRUE
 
 #include_next <halconf.h>

keyboards/keychron/v5/mcuconf.h

@@ -14,6 +14,8 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+#pragma once
+
 #include_next <mcuconf.h>
 
 #undef STM32_I2C_USE_I2C1

keyboards/keychron/v6/halconf.h

@@ -14,6 +14,8 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+#pragma once
+
 #define HAL_USE_I2C TRUE
 #define PAL_USE_CALLBACKS TRUE
 

keyboards/keychron/v6/mcuconf.h

@@ -14,6 +14,8 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+#pragma once
+
 #include_next <mcuconf.h>
 
 #undef STM32_I2C_USE_I2C1