media: staging: media: atomisp: code formatting changes atomisp_csi2.c

Several trivial code reformatting changes done according to the coding
style guidelines. These changes improves code organisation and readability
and also 4 address many chackpatch error, warning and check complaints.

Signed-off-by: Deepak R Varma <drv@mailo.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>