media: atomisp: sh_css: Removed #ifdef ISP2401 to make the driver generic

Removed #ifdef ISP2401 to expose the necessary functions for ISP2401 and
also make the driver generic.

Link: https://lore.kernel.org/r/20230802095606.1298152-7-hpa@redhat.com



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