media: atomisp: Compile the object codes for a generic driver

Since a generic driver should support every type of atomisp, all the
codes need to be compiled. The ISP2401 flag controls the Makefile to build
the binary file for ISP2400 and ISP2401. Therefore, this section of
Makefile should be removed allowing all the necessary codes can be built.
Moreover, some parts of "removing #ifdef ISP2401" works are related to it
so they were also removed here.

Link: https://lore.kernel.org/r/20230713100231.308923-10-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>