arm64: dts: rockchip: add csi dphy node to rk356x

Add the MIPI CSI DPHY node to the RK356x device tree.

Signed-off-by: Michael Riesch <michael.riesch@wolfvision.net>
Link: https://lore.kernel.org/r/20220720091527.1270365-4-michael.riesch@wolfvision.net


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