media: atomisp: use atomisp_css_update_stream() in more places

Use atomisp_css_update_stream() in 2 more places,
instead of open coding it.

Link: https://lore.kernel.org/linux-media/20220615205037.16549-38-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>