arm64: dts: qcom: msm8994: Add pmu node

Add the CPU PMU to get perf support for hardware events.
Signed-off-by: Konrad Dybcio <konradybcio@gmail.com>
Link: https://lore.kernel.org/r/20200623224813.297077-9-konradybcio@gmail.comSigned-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>

arch/arm64/boot/dts/qcom/msm8994.dtsi

@@ -148,6 +148,11 @@ memory {
 		reg = <0 0 0 0>;
 	};
 
+	pmu {
+		compatible = "arm,cortex-a53-pmu";
+		interrupts = <GIC_PPI 7 (GIC_CPU_MASK_SIMPLE(4)| IRQ_TYPE_LEVEL_HIGH)>;
+	};
+
 	reserved-memory {
 		#address-cells = <2>;
 		#size-cells = <2>;