media: staging: atomisp: fixes for "symbol was not declared. Should it be static?" sparse warnings

Defined some const arrays as static since they don't need external linkage.

Signed-off-by: Jeremy Sowden <jeremy@azazel.net>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>