ARM: dts: qcom: msm8226: Add PMU node

Enable perf events on MSM8226 devices by adding the PMU node.
Signed-off-by: Matti Lehtimäki <matti.lehtimaki@gmail.com>
Reviewed-by: Luca Weiss <luca@z3ntu.xyz>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230520121933.15533-3-matti.lehtimaki@gmail.com

arch/arm/boot/dts/qcom-msm8226.dtsi

@@ -47,6 +47,12 @@ scm {
 		};
 	};
 
+	pmu {
+		compatible = "arm,cortex-a7-pmu";
+		interrupts = <GIC_PPI 7 (GIC_CPU_MASK_SIMPLE(4) |
+					 IRQ_TYPE_LEVEL_HIGH)>;
+	};
+
 	reserved-memory {
 		#address-cells = <1>;
 		#size-cells = <1>;