media: atomisp: Remove empty isys_public.h

isys_public.h is empty, remove it.

Link: https://lore.kernel.org/r/20230715170906.3627-1-hdegoede@redhat.com



Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Kate Hsuan <hpa@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>