rockchip: rk3568: Add support for FriendlyARM NanoPi R5S

FriendlyARM 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

The device tree is taken from kernel v6.4-rc1.

Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
Signed-off-by: Tianling Shen <cnsztl@gmail.com>
6 files changed