[media] v4l: vsp1: Use pipeline display list to decide how to write to modules

This allows getting rid of the vsp1_device::use_dl field.

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>