libcamera: controls: Parse 'enum' in gen-controls.py

In preparation to add libcamera Camera properties definitions by re-using
the control generation framework, augment the gen_controls.py script to
support parsing the 'enum' yaml tag and generate documentation and
definition of possible values associated with a Control or a Property
and defined through an enumeration of supported values.

Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>

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