media: cedrus: Add H265 10-bit capability flag

Currently only H6 variant supports decoding 10-bit H265 videos.

Add a capability flag, so driver could determine if 10-bit H265 slices
should be allowed or not.

Signed-off-by: Jernej Skrabec <jernej.skrabec@gmail.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>