arm64: dts: rockchip: add RK3588 DP carrier from Theobroma Systems

The DisplayPort carrier is a very simple baseboard only providing serial,
ethernet and a displayport output.

But its main functionality is that it routes the Analogix eDP controller
to this DisplayPort output, which allows to test that controller simply
by hooking it up to a suitable monitor.

The Analogix-DP controller supports eDP 1.3 and DP 1.2, so can drive
both eDP displays as well as full DP monitors. It does not support DP+
so passive DP-to-HDMI adapters won't work.

Signed-off-by: Heiko Stuebner <heiko.stuebner@cherry.de>
Reviewed-by: Quentin Schulz <quentin.schulz@cherry.de>
Link: https://patch.msgid.link/20261002140330.2904616-3-heiko@sntech.de
Signed-off-by: Heiko Stuebner <heiko@sntech.de>

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