media: atomisp: remove unused atomisp_*css_* functions

With the removal of the ACC ioctls and atomisp_acc.c a whole bunch
of atomisp_*css_* functions is no longer used, remove them.

Link: https://lore.kernel.org/linux-media/20220615205037.16549-21-hdegoede@redhat.com


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