Power management fixes for v4.7-rc6

 - Fix a recent intel_pstate regression that caused the number of
   wakeups to increase significantly on an idle system in some cases
   due to excessive synchronize_sched() invocations (Rafael Wysocki).

 - Fix unnecessary invocations of WARN_ON() in the cpufreq core
   after cpufreq has been suspended introduced during the 4.6 cycla
   (Rafael Wysocki).

 - Fix an error code path in the cpufreq-dt-platdev driver that
   forgets to drop a reference to a DT node (Masahiro Yamada).
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