Power management fixes for v4.13-rc4

 - Fix the handling of the scaling_cur_freq cpufreq policy attribute
   on x86 systems with the MPERF/APERF registers present to make it
   behave more as expected after recent changes (Rafael Wysocki).

 - Drop a leftover callback from the intel_pstate driver which also
   prevents the cpuinfo_cur_freq cpufreq policy attribute from being
   incorrectly exposed when intel_pstate works in the active mode
   (Rafael Wysocki).

 - Add a missing piece describing the cpuinfo_cur_freq policy
   attribute to cpufreq documentation (Rafael Wysocki).

 - Fix up a recently added part of the Thunderbolt driver to avoid
   aborting system suspends if its mailbox commands time out (Rafael
   Wysocki).

 - Update device runtime PM framework documentation to reflect the
   current behavior of the code (Johan Hovold).
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