arm64: dts: imx8mq: Add ARM PMU node

Add the node for the ARM Performance Monitor Units.
Signed-off-by: Carlo Caione <ccaione@baylibre.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm64/boot/dts/freescale/imx8mq.dtsi

@@ -120,6 +120,13 @@ A53_L2: l2-cache0 {
 		};
 	};
 
+	pmu {
+		compatible = "arm,cortex-a53-pmu";
+		interrupts = <GIC_PPI 7 IRQ_TYPE_LEVEL_HIGH>;
+		interrupt-parent = <&gic>;
+		interrupt-affinity = <&A53_0>, <&A53_1>, <&A53_2>, <&A53_3>;
+	};
+
 	psci {
 		compatible = "arm,psci-1.0";
 		method = "smc";