media: atomisp: Remove some further ATOMISP_ACC_* related dead code

Remove some more code which is no longer referenced after the removal
of the ATOMISP_ACC_* custom ioctls.

Reviewed-by: Andy Shevchenko <andriy.shevchenko@intel.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>