virtio: make VIRTIO_F_VERSION_1 a transport bit

Activate VIRTIO_F_VERSION_1 automatically unless legacy_only
is set.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

diff --cc drivers/virtio/virtio.c
Simple merge

diff --cc drivers/virtio/virtio_ring.c
Simple merge

diff --cc include/uapi/linux/virtio_config.h
Simple merge