The vhost-scsi device string should depend on the requested
address type, not strictly on the emulated arch. This is the
same logic used by qemuBuildVirtioDevStr, and this particular
path is already tested in the hostdev-scsi-vhost-scsi-ccw tests
Reviewed-by: NAndrea Bolognani <abologna@redhat.com>
Signed-off-by: NCole Robinson <crobinso@redhat.com>