Ensure info.json layout macros are somewhat valid (#19236)

data/schemas/keyboard.jsonschema

@@ -245,6 +245,7 @@
                         "items": {
                             "type": "object",
                             "additionalProperties": false,
+                            "required": ["x", "y"],
                             "properties": {
                                 "label": {
                                     "type": "string",