media: rkvdec: h264: Limit minimum profile to constrained baseline

Neither the hardware nor the kernel API support FMO/ASO features
required by the full baseline profile. Therefore limit the minimum
profile to the constrained baseline profile explicitly.

Suggested-by: Nicolas Dufresne <nicolas.dufresne@collabora.com>
Signed-off-by: Sebastian Fricke <sebastian.fricke@collabora.com>
Signed-off-by: Nicolas Dufresne <nicolas.dufresne@collabora.com>
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>