media: rkvdec: Add H264 support for the VDPU381 variant

media: rkvdec: Add H264 support for the VDPU381 variant

This decoder variant is found in Rockchip RK3588 SoC family.

Like for rkvdec on rk3399, it supports the NV12, NV15, NV16 and NV20
output formats and level up to 6.0.

The maximum width and height have been significantly increased
supporting up to 65520 pixels for both.

Support for named register sections is added for this variant and future
ones.

Fluster score for JVT-AVC_V1 is 129/135.

Tested-by: Diederik de Haas <didi.debian@cknow.org>  # Rock 5B
Reviewed-by: Nicolas Dufresne <nicolas.dufresne@collabora.com>
Signed-off-by: Detlev Casanova <detlev.casanova@collabora.com>
Signed-off-by: Nicolas Dufresne <nicolas.dufresne@collabora.com>
Signed-off-by: Hans Verkuil <hverkuil+cisco@kernel.org>