utils: codegen: controls.py: Parse direction information

In preparation for adding support for querying direction information
from controls, parse the direction information from control ID
definitions. This can later be plugged in directly to the IPA code
generators simply by using ctrl.direction.

Signed-off-by: Paul Elder <paul.elder@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Stefan Klug <stefan.klug@ideasonboard.com>

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