arm64: dts: rockchip: Simplify VOP port definition on rk3328

arm64: dts: rockchip: Simplify VOP port definition on rk3328

When there's only 1 endpoint, there is no need for a unit-address and
removing that allows removing of related properties as well.

This fixes the following DTB validation warnings:

  graph node has single child node 'endpoint@0',
  #address-cells/#size-cells are not necessary

Signed-off-by: Diederik de Haas <didi.debian@cknow.org>
Link: https://lore.kernel.org/r/20250709132323.128757-5-didi.debian@cknow.org
Signed-off-by: Heiko Stuebner <heiko@sntech.de>