Make the driver work with stepping=0. Change-Id: Id0961369b9cc9cfe1b0c09ebc50e6966ccd2e919 Signed-off-by: Marshall Dawson <marshalldawson3rd@gmail.com> Reviewed-on: https://review.coreboot.org/c/coreboot/+/35273 Reviewed-by: Martin Roth <martinroth@google.com> Tested-by: build bot (Jenkins) <no-reply@coreboot.org>