rockchip: rk3568: Add support for FriendlyARM NanoPi R5C

FriendlyARM NanoPi R5C is an open-sourced mini IoT gateway device.

Specification:
- Rockchip RK3568
- 1/4GB LPDDR4X RAM
- 8/32GB eMMC
- SD card slot
- M.2 Connector
- 2x USB 3.0 Port
- 2x 2500 Base-T (PCIe, r8125)
- HDMI 2.0
- MIPI DSI/CSI
- USB Type C 5V

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>
diff --git a/arch/arm/dts/Makefile b/arch/arm/dts/Makefile
index c8d580b..a5eb929 100644
--- a/arch/arm/dts/Makefile
+++ b/arch/arm/dts/Makefile
@@ -171,6 +171,7 @@
 	rk3566-anbernic-rgxx3.dtb \
 	rk3566-radxa-cm3-io.dtb \
 	rk3568-evb.dtb \
+	rk3568-nanopi-r5c.dtb \
 	rk3568-nanopi-r5s.dtb \
 	rk3568-rock-3a.dtb