media: staging: rkisp1: rsz: get the capture format info from the capture struct

Currently the format info of the capture is retrieved by calling
the function v4l2_format_info. This is not needed since it is
already saved in the capture object.

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