BRANCH=none BUG=chrome-os-partner:54325, chrome-os-partner:54581 TEST=device off in devicetree should disable the device. Change-Id: I5dada06cba0eea8a30f297e3a6940a36b2ff40ee Signed-off-by: Jagadish Krishnamoorthy <jagadish.krishnamoorthy@intel.com> Reviewed-on: https://review.coreboot.org/15339 Tested-by: build bot (Jenkins) Reviewed-by: Aaron Durbin <adurbin@chromium.org>