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>

media: atomisp: get rid of version-dependent globals

Replace all occurrences along the atomisp tree for the conditional
compilation macros found at system_global.h, replacing them by
tests wheather ISP2401 is defined or not.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

media: atomisp: add SPDX headers

This driver is licensed under GPL 2.0, as stated inside their
headers.

Add the proper tag there. We should probably latter cleanup
the reduntant licensing text, but this could be done later,
after we get rid of other abstraction layers.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

media: atomisp: get rid of most checks for ISP2401 version

There are lots of places inside this driver checking for
ISP2400/ISP2401 verison. Get rid of most of those, while
keep building for both.

Most of stuff in this patch is trivial to solve.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

media: atomisp: cleanup directory hierarchy

This driver has very long directories without a good
reason (IMHO). Let's drop two directories from such hierarchy,
in order to simplify things a little bit and make the dir
output a bit more readable.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>