arm64: dts: rockchip: add Haikou baseboard with RK3399-Q7 SoM

Haikou is a Qseven and μQseven baseboard featuring PCIe, USB3 and a
video connector for MIPI-DSI/CSI and eDP adapter.

This dts is for usage with the RK3399-Q7 SoM Puma.

Signed-off-by: Klaus Goger <klaus.goger@theobroma-systems.com>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>