vhost: let SET_VRING_ENABLE message depends on protocol feature
But not depend on PROTOCOL_F_MQ feature bit. So that we could use SET_VRING_ENABLE to sign the backend on stop, even if MQ is disabled. That's reasonable, since we will have one queue pair at least. Signed-off-by: NYuanhan Liu <yuanhan.liu@linux.intel.com> Reviewed-by: NMichael S. Tsirkin <mst@redhat.com> Signed-off-by: NMichael S. Tsirkin <mst@redhat.com>
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