media: atomisp: remove some trivial wrappers from compat css20

There are tons of code inside atomisp_compat_css20.c, but
several of them are just trivial wrappers to other functions.

Getting rid of all of them will take some time, but let's
start getting rid of some of the trivial ones.

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