media: staging: rkisp1: capture: remove support to userptr memory

VB2_USERPTR support doesn't make sense for drivers based on
vb2_dma_contig, so just drop it.

Otherwise, queues using vb2_dma_contig_memops causes v4l2-compliance
to fail for VB2_USERPTR mode, due to buffer misalignment.

Signed-off-by: Dafna Hirschfeld <dafna.hirschfeld@collabora.com>
Acked-by: Helen Koike <helen.koike@collabora.com>
[hverkuil-cisco@xs4all.nl: replaced commit log with Helen's suggestion]
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>