ARM: dts: rockchip: Enable HDMI output for XPI-3128

Add an hdmi-connector node and enable the hdmi, display-subsystem and vop
nodes.

Signed-off-by: Alex Bee <knaerzche@gmail.com>
Link: https://lore.kernel.org/r/20231222174220.55249-30-knaerzche@gmail.com


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