arm64: dts: rockchip: fix px30 dsi node

With the conversion of rockchip,dw-mipi-dsi.yaml a port@1 node
is required, so add a node with label dsi_out.
Also add label dsi_in to port@0.

Signed-off-by: Johan Jonker <jbx6244@gmail.com>
Link: https://lore.kernel.org/r/1ee3e676-aef4-f464-82b0-8fb39ba5c60d@gmail.com


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