media: imx7-mipi-csis: Remove extra blank line

Checkpatch reports an extra blank line, so remove such unneeded
line.

Signed-off-by: Fabio Estevam <festevam@gmail.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>