Keyboard: Refactor lets split to use split common code (#4536)

* Refactor lets split to use split common code

* Refactor lets split to use split common code

* Build fixes for OLED_sample keymap

* Build fixes for OLED_sample keymap - attempt to reduce firmware size

keyboards/lets_split/sockets/config.h

@@ -16,10 +16,7 @@ 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 SOCKETS_CONFIG_H
-#define SOCKETS_CONFIG_H
-
-#include "config_common.h"
+#pragma once
 
 /* USB Device descriptor parameter */
 #define VENDOR_ID       0xBEE5
@@ -85,6 +82,3 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 //#define NO_ACTION_ONESHOT
 //#define NO_ACTION_MACRO
 //#define NO_ACTION_FUNCTION
-
-
-#endif

keyboards/lets_split/sockets/sockets.h

@@ -1,5 +1,4 @@
-#ifndef SOCKETS_H
-#define SOCKETS_H
+#pragma once
 #define DISABLE_JTAG // The keyboard uses PF4 and PF7, which are used by JTAG.
 
 #include "lets_split.h"
@@ -59,5 +58,3 @@
 #endif
 
 #define LAYOUT_ortho_4x12 LAYOUT
-
-#endif