Allow <keyboard>.h to be optional when going data driven (#12706)

* Allow <keyboard>.h to be optional when going data driven

* Remove stub files as no longer required

* Rename function

* Remove include of layouts.h for now

* Take advantage of type=keyboard_folder

* Take advantage of type=keyboard_folder - kb should still be mandatory

lib/python/qmk/cli/generate/__init__.py

@@ -3,6 +3,7 @@ from . import config_h
 from . import dfu_header
 from . import docs
 from . import info_json
+from . import keyboard_h
 from . import layouts
 from . import rgb_breathe_table
 from . import rules_mk