media: staging: rkisp1: rsz: fix resolution limitation on sink pad

Resizer sink pad is limited by what the ISP can generate.
The configurations describes what the resizer can produce.

This was tested on a Scarlet device with ChromiumOs, where the selfpath
receives 2592x1944 and produces 1600x1200 (which isn't possible without
this fix).

Fixes: 56e3b29f ("media: staging: rkisp1: add streaming paths")
Signed-off-by: Helen Koike <helen.koike@collabora.com>
Reviewed-by: Tomasz Figa <tfiga@chromium.org>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>