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

keyboards/boardsource/beiwagon/config.h

@@ -16,7 +16,6 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
 #pragma once
-#define RGB_DI_PIN C6
 #define RGB_MATRIX_LED_COUNT 18
 #define ENABLE_RGB_MATRIX_GRADIENT_UP_DOWN
 #define ENABLE_RGB_MATRIX_GRADIENT_LEFT_RIGHT

keyboards/boardsource/beiwagon/info.json

@@ -10,6 +10,9 @@
     "mousekey": false,
     "rgb_matrix": true
   },
+  "ws2812": {
+    "pin": "C6"
+  },
   "matrix_pins": {
     "cols": ["B5", "B6", "B7"],
     "rows": ["B0", "B1", "B2", "B3"]