Keyboard: Add Nyquist Rev 3 (#4287)

* Add Nyquist Rev 3

* Switch to split_common

keyboards/nyquist/rev2/config.h

@@ -15,10 +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 REV2_CONFIG_H
-#define REV2_CONFIG_H
-
-#include QMK_KEYBOARD_CONFIG_H
+#pragma once
 
 /* USB Device descriptor parameter */
 #define VENDOR_ID       0xCB10
@@ -82,5 +79,3 @@ 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/nyquist/rev2/rev2.h

@@ -1,5 +1,4 @@
-#ifndef REV2_H
-#define REV2_H
+#pragma once
 
 #include "nyquist.h"
 
@@ -64,5 +63,3 @@
 #endif
 
 #define LAYOUT_ortho_5x12 LAYOUT
-
-#endif