Virtio 1.0 allows a more flexible virtio ring layout, so we have to set
addresses for descriptors avail flags and use flags separately. We
continue to use a ring layout compatible with virtio 0.9.5 though, so no
other changes are needed to setup the virtio queues.
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com> Reviewed-by: Philippe Mathieu-Daude <philmd@redhat.com> Reviewed-by: Jiewen Yao <jiewen.yao@intel.com>