ARM64: zynqmp: Add missing interrupt-parent to PMU node

ZynqMP is not using global interrupt-parent setting that's why
it has to be listed in every node separately. PMU node missed it and
this patch is adding it.

Reported-by: John Linn <John.Linn@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>

arch/arm/dts/zynqmp.dtsi

@@ -217,6 +217,7 @@
 
 	pmu {
 		compatible = "arm,armv8-pmuv3";
+		interrupt-parent = <&gic>;
 		interrupts = <0 143 4>,
 			     <0 144 4>,
 			     <0 145 4>,