media: atomisp: drop contiguous flag from struct ia_css_frame

Drop the contiguous flag from struct ia_css_frame, it is always false /
not used.

Link: https://lore.kernel.org/linux-media/20220615205037.16549-8-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>