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/arch/arm/dts/rk3399-rock-pi-4c-u-boot.dtsi b/arch/arm/dts/rk3399-rock-pi-4c-u-boot.dtsi
new file mode 100644
index 0000000..85ee577
--- /dev/null
+++ b/arch/arm/dts/rk3399-rock-pi-4c-u-boot.dtsi
@@ -0,0 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2019 Jagan Teki <jagan@amarulasolutions.com>
+ */
+
+#include "rk3399-rock-pi-4-u-boot.dtsi"