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

keyboards/contender/config.h

@@ -17,7 +17,6 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 #pragma once
 
-#define RGB_DI_PIN C6
 #define RGBLED_NUM 33
 #define RGBLIGHT_LED_MAP { \
    0, 1, 2, 3, \

keyboards/contender/info.json

@@ -8,6 +8,9 @@
         "pid": "0xC010",
         "device_version": "0.0.1"
     },
+    "ws2812": {
+        "pin": "C6"
+    },
     "matrix_pins": {
         "cols": ["C7", "D6", "B3", "B0", "B1"],
         "rows": ["D4", "D3", "B5", "B7", "B4", "B2"]