ARM: dts: rockchip: fix rk3288 lvds node

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

Signed-off-by: Johan Jonker <jbx6244@gmail.com>
Link: https://lore.kernel.org/r/e7b78a73-0e89-d9e9-2ecc-a8a380635f64@gmail.com


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