media: staging: add missing blank line after declarations in atomisp-ov5693

Fix "Missing a blank line after declarations" warning reported by
checkpatch.

Signed-off-by: Riccardo Schirone <sirmy15@gmail.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>