RGB Matrix: driver naming cleanups (#21594)

keyboards/ymdk/id75/info.json

@@ -67,7 +67,7 @@
             "solid_splash": true,
             "solid_multisplash": true
         },
-        "driver": "WS2812",
+        "driver": "ws2812",
         "layout": [
             {"flags": 4, "matrix": [4, 14], "x": 224, "y": 64},
             {"flags": 4, "matrix": [4, 13], "x": 208, "y": 64},

keyboards/ymdk/ymd09/info.json

@@ -46,7 +46,7 @@
         }
     },
     "rgb_matrix": {
-        "driver": "WS2812",
+        "driver": "ws2812",
         "layout": [
             {"flags": 4, "matrix": [0, 2], "x": 64, "y": 0},  //7
             {"flags": 4, "matrix": [0, 1], "x": 32, "y": 0},  //8

keyboards/ymdk/ymd40/air40/info.json

@@ -9,7 +9,7 @@
         "device_version": "0.0.1"
     },
     "rgb_matrix": {
-        "driver": "WS2812"
+        "driver": "ws2812"
     },
     "matrix_pins": {
         "cols": ["F1", "F0", "B0", "C7", "F4", "F5", "F6", "F7", "D4", "D6", "B4", "D7"],