arm64: dts: rockchip: Add Radxa ROCK Pi 4C support

Rock PI 4C has AP6256 Wifi/BT, PoE, miniDP, USB Host enabled
GPIO pin change compared to 4B, 4C.

So, add or enable difference nodes/properties in 4C dts
by including common dtsi.

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
diff --git a/board/rockchip/evb_rk3399/MAINTAINERS b/board/rockchip/evb_rk3399/MAINTAINERS
index 578638a..4c889e0 100644
--- a/board/rockchip/evb_rk3399/MAINTAINERS
+++ b/board/rockchip/evb_rk3399/MAINTAINERS
@@ -68,6 +68,8 @@
 S:	Maintained
 F:	configs/rock-pi-4-rk3399_defconfig
 F:	arch/arm/dts/rk3399-rock-pi-4-u-boot.dtsi
+F:	configs/rock-pi-4c-rk3399_defconfig
+F:	arch/arm/dts/rk3399-rock-pi-4c-u-boot.dtsi
 
 ROCK-PI-N10
 M:	Jagan Teki <jagan@amarulasolutions.com>