Migrate rgblight.pin and RGB_DI_PIN to ws2812.pin (#20303)

keyboards/9key/config.h

@@ -17,9 +17,6 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 #pragma once
 
-/* ws2812 RGB LED */
-#define RGB_DI_PIN F7
-
 #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"
   },
+  "ws2812": {
+    "pin": "F7"
+  },
   "matrix_pins": {
     "cols": ["F4", "F5", "F6"],
     "rows": ["D1", "D0", "D4"]