arm64: dts: qcom: sa8775p: add the PMU node

Add the PMU node for sa8775p platforms.
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230414123016.176457-1-brgl@bgdev.pl

arch/arm64/boot/dts/qcom/sa8775p.dtsi

@@ -288,6 +288,11 @@ opp-100000000 {
 		};
 	};
 
+	pmu {
+		compatible = "arm,armv8-pmuv3";
+		interrupts = <GIC_PPI 7 IRQ_TYPE_LEVEL_HIGH>;
+	};
+
 	psci {
 		compatible = "arm,psci-1.0";
 		method = "smc";