Move RGBLED_SPLIT to data driven (#21113)

Co-authored-by: Joel Challis <git@zvecr.com>

keyboards/arabica37/rev1/config.h

@@ -19,7 +19,6 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #pragma once
 
 #define RGBLED_NUM 50    // Number of LEDs
-#define RGBLED_SPLIT {25, 25}
 /*
  * Feature disable options
  *  These options are also useful to firmware size reduction.

keyboards/arabica37/rev1/info.json

@@ -16,6 +16,9 @@
     "split": {
         "soft_serial_pin": "D2"
     },
+    "rgblight": {
+        "split_count": [25, 25]
+    },
     "ws2812": {
         "pin": "D3"
     },