Move RGBLIGHT_SPLIT to data driven (#21190)

* Move `RGBLIGHT_SPLIT` to data driven

* Remove where `split_count` is already set

keyboards/redox/rev1/config.h

@@ -24,8 +24,6 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 #define RGBLED_NUM 14    // Number of LEDs
 
-#define RGBLIGHT_SPLIT   // sync LEDs between RIGHT and LEFT hand
-
 /*
  * Feature disable options
  *  These options are also useful to firmware size reduction.

keyboards/redox/rev1/info.json

@@ -8,6 +8,9 @@
     "pid": "0x5244",
     "device_version": "1.0.0"
   },
+  "rgblight": {
+    "split": true
+  },
   "layouts": {
     "LAYOUT": {
       "layout": [