Fix Clueboard hotswap gen1 not compiling when LED Matrix is disabled

keyboards/clueboard/66_hotswap/gen1/gen1.c

@@ -14,15 +14,10 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 #include "gen1.h"
-#include "is31fl3731-simple.h"
-
-void matrix_init_kb(void) {
-}
-
-void matrix_scan_kb(void) {
-}
 
 #ifdef LED_MATRIX_ENABLE
+    #include "is31fl3731-simple.h"
+
 const is31_led g_is31_leds[LED_DRIVER_LED_COUNT] = {
 /* Refer to IS31 manual for these locations
  *  driver