media: atomisp: cleanup ia_css_isp_configs() code

The auto-generated code inside ia_css_isp_configs() is more
complex than it should be. Also, it doesn't return any errors.

However, the functions called by it can mis-configure the pipelines,
but, as there's no way to return errors, it internally calls the
assert() macro.

So, add a return parameter to each routine there, in order to
prepare the code to be more robust.

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

media: atomisp: remove struct ia_css_isp_parameter

This patch removes `struct ia_css_isp_parameter sc` from
`struct ia_css_config_memory_offsets` as well as its usage [1].

[1] added on updating css version to irci_master_20150701_0213
https://raw.githubusercontent.com/intel/ProductionKernelQuilts/cht-m1stable-2016_ww31/uefi/cht-m1stable/patches/cam-0439-atomisp2-css2401-and-2401_legacy-irci_master_2015070.patch
("atomisp2: css2401 and 2401_legacy-irci_master_20150701_0213")

Signed-off-by: Tsuchiya Yuto <kitakar@gmail.com>
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: move ia_css_configure_sc() implementation

With the changes, this function is now undefined if built
for ISP2400. So, move its implementation to the file which
calls it.

Reported-by: Francescodario Cuzzocrea <francescodario.cuzzocrea@mail.polimi.it>
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>