arm64: dts: imx8ulp: add pmu node

Add i.MX8ULP pmu node
Signed-off-by: NPeng Fan <peng.fan@nxp.com>
Signed-off-by: NShawn Guo <shawnguo@kernel.org>

arch/arm64/boot/dts/freescale/imx8ulp.dtsi

@@ -63,6 +63,14 @@
 		interrupts = <GIC_PPI 9 IRQ_TYPE_LEVEL_HIGH>;
 	};
 
+	pmu {
+		compatible = "arm,cortex-a35-pmu";
+		interrupt-parent = <&gic>;
+		interrupts = <GIC_PPI 7
+			     (GIC_CPU_MASK_SIMPLE(2) | IRQ_TYPE_LEVEL_HIGH)>;
+		interrupt-affinity = <&A35_0>, <&A35_1>;
+	};
+
 	psci {
 		compatible = "arm,psci-1.0";
 		method = "smc";