media: atomisp: Remove atomisp_video_init() parametrization

Now that we only have a single /dev/video# node it is no longer
necessary for atomisp_video_init() to be parametrized.

Remove its parameters and while at it also change the name
from the single /dev/video# node from "ATOMISP ISP PREVIEW output"
to "ATOMISP video output".

Link: https://lore.kernel.org/r/20230518153733.195306-4-hdegoede@redhat.com



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