Move RGBLED_NUM to data driven (#21278)

keyboards/9key/config.h

@@ -17,6 +17,4 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 #pragma once
 
-#define RGBLED_NUM 1    // Number of LEDs
-
 #define TAPPING_TERM 200

keyboards/9key/info.json

@@ -8,6 +8,9 @@
     "pid": "0x0007",
     "device_version": "0.0.1"
   },
+  "rgblight": {
+    "led_count": 1
+  },
   "ws2812": {
     "pin": "F7"
   },