media: verisilicon: Store reference frames pixels format

The Hantro decoder always produces tiled pixel-formats, but when the
post-processor is used, the destination pixel-format is a non-tiled
pixel-format. This causes an incorrect computation of the reference
frame size and offsets. Get and save the correct tiled pixel-format for
8 and 10 bit streams to solve these computation issues.

Fluster VP9 score increase to 166/305 (vs 145/305).
HEVC score is still 141/147.

Signed-off-by: Benjamin Gaignard <benjamin.gaignard@collabora.com>
Reviewed-by: Nicolas Dufresne <nicolas.dufresne@collabora.com>
Signed-off-by: Sebastian Fricke <sebastian.fricke@collabora.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>