Move tmk_core/common/backlight to quantum/backlight (#6710)

* Move tmk_core/common/backlight to quantum/backlight

* Add guards to backlight inclusion

* Add guards to backlight inclusion

* Update backlight guards on clueboard/60

* Use full paths to avoid vpath issues

tmk_core/common/action.c

@@ -20,7 +20,6 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #include "mousekey.h"
 #include "command.h"
 #include "led.h"
-#include "backlight.h"
 #include "action_layer.h"
 #include "action_tapping.h"
 #include "action_macro.h"
@@ -28,6 +27,10 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #include "action.h"
 #include "wait.h"
 
+#ifdef BACKLIGHT_ENABLE
+#    include "backlight.h"
+#endif
+
 #ifdef DEBUG_ACTION
 #    include "debug.h"
 #else