media: staging: rkisp1: isp: don't enable signal RKISP1_CIF_ISP_FRAME_IN

The signal RKISP1_CIF_ISP_FRAME_IN is not used in the isr so
there is no need to enable it.

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>