media: rkvdec: Add HEVC backend

media: rkvdec: Add HEVC backend

The Rockchip VDEC supports the HEVC codec with the Main and Main10
Profile up to Level 5.1 High tier: 4096x2304@60 fps.

Add the backend for HEVC format to the decoder.

Signed-off-by: Alex Bee <knaerzche@gmail.com>
Signed-off-by: Sebastian Fricke <sebastian.fricke@collabora.com>
Tested-by: Nicolas Dufresne <nicolas.dufresne@collabora.com>
Reviewed-by: Nicolas Dufresne <nicolas.dufresne@collabora.com>
Signed-off-by: Jonas Karlman <jonas@kwiboo.se>
Tested-by: Diederik de Haas <didi.debian@cknow.org>  # Rock64, RockPro64, Quartz64-B, NanoPi R5S
Tested-by: Detlev Casanova <detlev.casanova@collabora.com> # RK3399
Signed-off-by: Nicolas Dufresne <nicolas.dufresne@collabora.com>
Signed-off-by: Hans Verkuil <hverkuil+cisco@kernel.org>