arm64: dts: rockchip: add rx0 mipi-phy for rk3399

Designware MIPI D-PHY, used for ISP0 in rk3399.

Verified with:
make ARCH=arm64 dtbs_check DT_SCHEMA_FILES=Documentation/devicetree/bindings/phy/rockchip-mipi-dphy-rx0.yaml

Signed-off-by: Shunqian Zheng <zhengsq@rock-chips.com>
Signed-off-by: Jacob Chen <jacob2.chen@rock-chips.com>
Signed-off-by: Helen Koike <helen.koike@collabora.com>
Link: https://lore.kernel.org/r/20200403161538.1375908-9-helen.koike@collabora.com


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