arm64: dts: rockchip: Add FriendlyElec Nanopi R5S

FriendlyElec Nanopi R5S is an open-sourced mini IoT gateway device.

Board Specifications
- Rockchip RK3568
- 2 or 4GB LPDDR4X
- 8GB or 16GB eMMC, SD card slot
- GbE LAN (Native)
- 2x 2.5G LAN (PCIe)
- M.2 Connector
- HDMI 2.0, MIPI DSI/CSI
- 2xUSB 3.0 Host
- USB Type C PD, 5V/9V/12V
- GPIO: 12-pin 0.5mm FPC connector

Based on Tianling Shen's <cnsztl@gmail.com> work.

Signed-off-by: Vasily Khoruzhick <anarsoul@gmail.com>
Link: https://lore.kernel.org/r/20230308063240.107178-2-anarsoul@gmail.com


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