Power management fixes for v4.11-rc7

 - Allow CPUs to be put back online even if the cpufreq driver is
   unable to work with them (eg. due to missing information from
   platform firmware), which was the previous behavior expected by
   users, but changed in the 4.9 time frame (Chen Yu).

 - Fix a few minor issues in the turbostat utility, introduced mostly
   during the recent update of it (Len Brown, Doug Smythies).

 - Fix a cpupower utility bug causing it to report incorrect values
   for turbo frequencies in some cases (Ben Hutchings).
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