Make Ergodox EZ Glow's rgb matrix user configurable

keyboards/ergodox_ez/ergodox_ez.c

@@ -269,6 +269,7 @@ const is31_led g_is31_leds[DRIVER_LED_TOTAL] = {
 };
 
 
+__attribute__ ((weak))
 const rgb_led g_rgb_leds[DRIVER_LED_TOTAL] = {
 
     /*{row | col << 4}