media: atomisp: Remove continuous mode related code from atomisp_set_fmt()

Remove code to check / adjust code between video and preview /
capture and view-finder nodes now that we no longer support
continuous mode and this no longer support streaming from 2
/dev/video# nodes at the same time.

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>