Change keyboard level include guards to pragma once (#14248)

* Change keyboard level include guards to `pragma once`

And clean up a lot of layout macros

* Oops

* Remove dangling endif

keyboards/kinesis/alvicstep/config.h

@@ -1,5 +1,4 @@
-#ifndef ALVICSTEP_CONFIG_H
-#define ALVICSTEP_CONFIG_H
+#pragma once
 
 #include "../config.h"
 #include "config_common.h"
@@ -31,6 +30,3 @@
 
 /* COL2ROW or ROW2COL */
 #define DIODE_DIRECTION COL2ROW
- 
-
-#endif