Merge tag 'xgene-drivers-for-4.9' of https://github.com/AppliedMicro/xgene-next into...

Merge tag 'xgene-drivers-for-4.9' of https://github.com/AppliedMicro/xgene-next into next/drivers

Pull "X-Gene driver changes queued for v4.9" from Duc Dang:

This patch set includes:
+ X-Gene SoC Performance Monitoring Unit (PMU) driver

* tag 'xgene-drivers-for-4.9' of https://github.com/AppliedMicro/xgene-next:
  perf: xgene: Add APM X-Gene SoC Performance Monitoring Unit driver
  Documentation: Add documentation for APM X-Gene SoC PMU DTS binding
  MAINTAINERS: Add entry for APM X-Gene SoC PMU driver