media: atomisp: Remove accelerator pipe creation code

The ATOMISP_ACC_* custom ioctls and the ACC device node have been removed
in commit a5c17adbadcb ("media: atomisp: Remove the ACC device node").

This means that pipe_configs[pipe_id].acc_extension now never gets set
which causes atomisp_compat_css20.c: __create_pipe() to always skip
creation of pipes with a pipe_id of IA_CSS_PIPE_ID_ACC / a mode of
IA_CSS_PIPE_MODE_ACC.

This allows removing of the acc_pipe creation / handling code
from mainly sh_css.c and a bunch of other places.

Reviewed-by: Andy Shevchenko <andy@kernel.org>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>