Power management updates for 3.4

Assorted extensions and fixes including:

* Introduction of early/late suspend/hibernation device callbacks.
* Generic PM domains extensions and fixes.
* devfreq updates from Axel Lin and MyungJoo Ham.
* Device PM QoS updates.
* Fixes of concurrency problems with wakeup sources.
* System suspend and hibernation fixes.
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Merge branch 'pm-domains'

* pm-domains:
  PM / Domains: Check domain status during hibernation restore of devices