media: staging: rkisp1: cap: simplify link validation by comparing media bus code

The capture has a mapping of the mbus code needed for each pixelformat.
This can be used to simplify the link validation by comparing the mbus
code in the capture with the code in the resizer.

Signed-off-by: Dafna Hirschfeld <dafna.hirschfeld@collabora.com>
Acked-by: Helen Koike <helen.koike@collabora.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>