ARM: dts: RealView: Fix the name of the SoC node

Drop the surplus @0 on the soc node making the devicetree
conform strictly to the schema.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

arch/arm/boot/dts/arm-realview-pbx.dtsi

@@ -210,7 +210,7 @@ vga_con_in: endpoint {
 		};
 	};
 
-	soc: soc@0 {
+	soc: soc {
 		compatible = "arm,realview-pbx-soc", "simple-bus";
 		#address-cells = <1>;
 		#size-cells = <1>;