media: atomisp: get rid of some broken code

Probably due to some version conflicts while the atomisp code
were generated, some things don't build for ISP2401. So, use
the ISP2400 variant when available, or get rid of the
code that doesn't build.

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