media: cedrus: Relax HEVC SPS restrictions

Testing reference video TSUNEQBD_A_MAIN10_Technicolor_2 has show that
Cedrus is capable of decoding frames with different chroma and luma bit
depths.

Relax restrictions so only highest depth is checked.

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@kernel.org>