Change license to BSD-2-Clause-Patent using an SPDX-License-Identifier statement. Cc: Leif Lindholm <leif@nuviainc.com> Cc: Ard Biesheuvel <ard.biesheuvel@arm.com> Signed-off-by: Michael D Kinney <michael.d.kinney@intel.com> Reviewed-by: Leif Lindholm <leif@nuviainc.com> Acked-by: Ard Biesheuvel <ard.biesheuvel@arm.com>