arm64: dts: rockchip: add isp0 node for rk3399

RK3399 has two ISPs, but only isp0 was tested.
Add isp0 node in rk3399 dtsi

Verified with:
make ARCH=arm64 dtbs_check DT_SCHEMA_FILES=Documentation/devicetree/bindings/media/rockchip-isp1.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/20201020193850.1460644-9-helen.koike@collabora.com


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