ARM: dts: rockchip: drop unneeded properties from mipi node

The mipi controller node does contain an unused reg property as well as
unnecessary #address-cells and #size-cells properties for subnodes
not using addresses, so remove those to also make dtc happy.
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Acked-by: Rob Herring <robh@kernel.org>

arch/arm/boot/dts/rk3288.dtsi

@@ -888,10 +888,6 @@ mipi_dsi: mipi@ff960000 {
 		status = "disabled";
 
 		ports {
-			#address-cells = <1>;
-			#size-cells = <0>;
-			reg = <1>;
-
 			mipi_in: port {
 				#address-cells = <1>;
 				#size-cells = <0>;