Allow NO_PIN within info.json (#16359)

data/schemas/definitions.jsonschema

@@ -51,6 +51,10 @@
     },
     "mcu_pin": {
         "oneOf": [
+            {
+                "type": "string",
+                "enum": ["NO_PIN"]
+            },
             {
                 "type": "string",
                 "pattern": "^[A-K]\\d{1,2}$"