arm64: dts: rockchip: fix px30 lvds node

With the conversion of rockchip,lvds.yaml a port@1 node
is required, so add a node with label lvds_out.
Also add label lvds_in to port@0.

Signed-off-by: Johan Jonker <jbx6244@gmail.com>
Link: https://lore.kernel.org/r/99895a4b-25c4-4b64-42ac-6f70940ab56e@gmail.com


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