Swap sd_cs_pin to sdCardCS in schema

Author: tyeth

boards/metroesp32s3/definition.json

@@ -10,7 +10,7 @@
     "installMethod":"uf2",
     "installBoardName": "metro_esp32s3",
     "published":true,
-    "sd_cs_pin": 45,
+    "sdCardCS": 45,
     "components":{
        "digitalPins":[
          {

boards/schema.json

@@ -75,7 +75,7 @@
       "description": "Whether this board supports online mode, or is offline only.",
       "type": "boolean"
     },
-    "sd_cs_pin": {
+    "sdCardCS": {
       "description": "Information about the default SD Card Chip Select pin present on this board.",
       "type": "number"
     },