We hope to at some point deprecate KVM legacy device assignment in
favor of VFIO-based assignment.  Towards that end, allow legacy
device assignment to be deconfigured.
Signed-off-by: NAlex Williamson <alex.williamson@redhat.com>
Reviewed-by: NAlexander Graf <agraf@suse.de>
Acked-by: NMichael S. Tsirkin <mst@redhat.com>
Signed-off-by: NGleb Natapov <gleb@redhat.com>