media: rkvdec: Hook the (TRY_)DECODER_CMD stateless ioctls

media: rkvdec: Hook the (TRY_)DECODER_CMD stateless ioctls

[ Upstream commit 1fb7b5ab62113b29ce331464048d8c39e58fd08a ]

The (TRY_)DECODER_CMD ioctls are used to support flushing when holding
capture buffers is supported. This is the case of this driver but the
ioctls were never hooked to the ioctl ops.

Add them to correctly support flushing.

Fixes: ed7bb87d3d03 ("media: rkvdec: Enable capture buffer holding for H264")
Signed-off-by: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
Reviewed-by: Daniel Almeida <daniel.almeida@collabora.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>