media: atomisp: Propagate v4l2_mbus_framefmt.field to CSI port sink pad

Most sensor drivers report V4L2_FIELD_NONE as v4l2_mbus_framefmt.field
value. Propagate this to the v4l2_mbus_framefmt for the CSI port to pass
the link validation done by media_pipeline_start().

Keep the v4l2_mbus_framefmt.field for the source pad of the CSI port
as V4L2_FIELD_ANY to match the ISP sink pad.

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>