utils: gen-controls: Factor out YAML data handling in classes

The gen-controls.py script handles the data structure produced by the
YAML parser manually through the whole code base. Clean this up by
encapsulating it in Control and ControlEnum classes to model a control
and its enum values respectively, to decouple YAML data handling from
generation.

No functional change intended.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
Reviewed-by: Umang Jain <umang.jain@ideasonboard.com>

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