ARM: dts: r7s72100: Add PMU device node

Enable support for the ARM Performance Monitor Units in the Cortex-A9
CPU core on RZ/A1H by adding a device node for the PMU.

New Linux output:

    hw perfevents: enabled with armv7_cortex_a9 PMU driver, 7 counters available
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

arch/arm/boot/dts/r7s72100.dtsi

@@ -77,6 +77,11 @@ p1_clk: p1 {
 		clock-div = <6>;
 	};
 
+	pmu {
+		compatible = "arm,cortex-a9-pmu";
+		interrupts-extended = <&gic GIC_PPI 0 IRQ_TYPE_LEVEL_HIGH>;
+	};
+
 	rtc_x1_clk: rtc_x1 {
 		#clock-cells = <0>;
 		compatible = "fixed-clock";