arm: dts: lpc32xx: add reg property to cpu device node

According to device tree bindings for ARM cpus cpu node must contain a
reg property for enumeration scheme.

The change adds reg = <0x0> indicating that the processor does not
have CPU identification register and updates cell settings.
Signed-off-by: Vladimir Zapolskiy <vz@mleia.com>

arch/arm/boot/dts/lpc32xx.dtsi

@@ -18,12 +18,13 @@ / {
 	interrupt-parent = <&mic>;
 
 	cpus {
-		#address-cells = <0>;
+		#address-cells = <1>;
 		#size-cells = <0>;
 
-		cpu {
+		cpu@0 {
 			compatible = "arm,arm926ej-s";
 			device_type = "cpu";
+			reg = <0x0>;
 		};
 	};