Configure RGBLIGHT_SPLIT for Mint60 (#8788)

keyboards/mint60/config.h

@@ -148,6 +148,7 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #define RGB_DI_PIN D3
 
 #define RGBLED_NUM 8
+#define RGBLIGHT_SPLIT
 
 #define RGBLIGHT_HUE_STEP 10
 #define RGBLIGHT_SAT_STEP 17