media: atomisp: remove no longer used atomisp_css_acc_done() function

atomisp_css_acc_done() is no longer used anywhere, remove it.

Link: https://lore.kernel.org/linux-media/20220615205037.16549-23-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>