ARM: sun7i: Add ARM PMU in A20 DTSI

Enable the performance monitoring unit found in the A20 SoCs.
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>

arch/arm/boot/dts/sun7i-a20.dtsi

@@ -57,6 +57,12 @@ timer {
 			     <1 10 0xf08>;
 	};
 
+	pmu {
+		compatible = "arm,cortex-a7-pmu", "arm,cortex-a15-pmu";
+		interrupts = <0 120 4>,
+			     <0 121 4>;
+	};
+
 	clocks {
 		#address-cells = <1>;
 		#size-cells = <1>;