ARM: dts: exynos5440: cpus/cpu nodes dts updates

This patch updates the in-kernel dts files according to the latest cpus
and cpu bindings updates for ARM.
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>

arch/arm/boot/dts/exynos5440.dtsi

@@ -38,18 +38,22 @@ cpus {
 		#size-cells = <0>;
 
 		cpu@0 {
+			device_type = "cpu";
 			compatible = "arm,cortex-a15";
 			reg = <0>;
 		};
 		cpu@1 {
+			device_type = "cpu";
 			compatible = "arm,cortex-a15";
 			reg = <1>;
 		};
 		cpu@2 {
+			device_type = "cpu";
 			compatible = "arm,cortex-a15";
 			reg = <2>;
 		};
 		cpu@3 {
+			device_type = "cpu";
 			compatible = "arm,cortex-a15";
 			reg = <3>;
 		};