[media] atomisp: eliminate dead code under HAS_RES_MGR

This define is never set and these code paths are never used so they can go
away.

Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>