media: cedrus: Remove the MBUS quirks

Now that the MBUS quirks are applied by our global notifier, we can
remove them from Cedrus. Since the only quirk was whether or not we had
to apply that DMA quirk, we can also remove the quirks infrastructure.

Suggested-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Reviewed-by: Chen-Yu Tsai <wens@csie.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Acked-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>