dt-bindings: soc: rockchip: add naneng combo phy register compatible

Add Naneng combo phy register compatible.

Signed-off-by: Johan Jonker <jbx6244@gmail.com>
Signed-off-by: Yifeng Zhao <yifeng.zhao@rock-chips.com>
Acked-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20220324120122.1339-1-jbx6244@gmail.com


Signed-off-by: Heiko Stuebner <heiko@sntech.de>