ARM: dts: prima2: add node for Performance Monitor Unit

It enables Performance Monitor Unit on CSR SiRFprimaII.
Signed-off-by: Ye He <ye.he@csr.com>
Signed-off-by: Barry Song <Baohua.Song@csr.com>

arch/arm/boot/dts/prima2.dtsi

@@ -41,6 +41,11 @@ cpu@0 {
 		};
 	};
 
+	arm-pmu {
+		compatible = "arm,cortex-a9-pmu";
+		interrupts = <29>;
+	};
+
 	axi {
 		compatible = "simple-bus";
 		#address-cells = <1>;