ARM: dts: nspire: Fix cpu node to conform with DT binding

This node does not follow the DT binding schema, correct this.
Should result in no functional change.
Signed-off-by: Andrew Davis <afd@ti.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

arch/arm/boot/dts/nspire/nspire.dtsi

@@ -11,8 +11,13 @@ / {
 	interrupt-parent = <&intc>;
 
 	cpus {
+		#address-cells = <1>;
+		#size-cells = <0>;
+
 		cpu@0 {
 			compatible = "arm,arm926ej-s";
+			device_type = "cpu";
+			reg = <0>;
 		};
 	};