Various fixes for new-keyboard (#16358)

lib/python/qmk/info.py

@@ -49,6 +49,7 @@ def info_json(keyboard):
         'parse_errors': [],
         'parse_warnings': [],
         'maintainer': 'qmk',
+        'manufacturer': 'qmk',
     }
 
     # Populate the list of JSON keymaps