Sync rk3399-opp.dtsi from Linux.
Linux commit details about the rk3399-opp.dtsi sync:
"arm64: dts: rockchip: use SPDX-License-Identifier"
(sha1: 4ee99cebd486238ac433da823b95cc5f8d8a6905)
Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Reviewed-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>