Replace manual extraction of data from YAML with the Control helper
class. This centralizes YAML parsing and avoids manual mistakes.
In order to import the controls module, add the utils/codegen/ directory
to the PYTHONPATH through the Python build environment.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Reviewed-by: Paul Elder <paul.elder@ideasonboard.com>
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