Power management fixes for 4.17-rc5

 - Restore device_may_wakeup() check in pci_enable_wake() removed
   inadvertently during the 4.13 cycle to prevent systems from
   drawing excessive power when suspended or off, among other
   things (Rafael Wysocki).

 - Fix pci_dev_run_wake() to properly handle devices that only can
   signal PME# when in the D3cold power state (Kai Heng Feng).

 - Fix the schedutil cpufreq governor to avoid using UINT_MAX
   as the new CPU frequency in some cases due to a missing check
   (Rafael Wysocki).

 - Remove a stale comment regarding worker kthreads from the
   schedutil cpufreq governor (Juri Lelli).

 - Fix a copy-paste mistake in the intel_pstate driver documentation
   (Juri Lelli).

 - Fix a typo in the system sleep states documentation (Jonathan
   Neuschäfer).
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