arm64: dts: rockchip: update mipi cells for RK3399

We might include additional ports in derivative device trees, so the
'port' node should have an address, and the parent 'ports' node needs
/#{addres,size}-cells.
Signed-off-by: Nickey Yang <nickey.yang@rock-chips.com>
Signed-off-by: Brian Norris <briannorris@chromium.org>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>

arch/arm64/boot/dts/rockchip/rk3399.dtsi

@@ -1664,7 +1664,11 @@ mipi_dsi: mipi@ff960000 {
 		status = "disabled";
 
 		ports {
-			mipi_in: port {
+			#address-cells = <1>;
+			#size-cells = <0>;
+
+			mipi_in: port@0 {
+				reg = <0>;
 				#address-cells = <1>;
 				#size-cells = <0>;