Power management updates for v4.11-rc2

 - Three fixes for intel_pstate problems related to the passive
   mode (in which it acts as a regular cpufreq scaling driver), two
   for the handling of global P-state limits and one for the handling
   of the cpu_frequency tracepoint in that mode (Rafael Wysocki).

 - Three fixes for the handling of P-state limits in intel_pstate in
   the active mode (Rafael Wysocki).

 - Introduction of a new cpufreq.off=1 kernel command line argument
   that will disable cpufreq entirely if passed to the kernel and
   is simply hooked up to the existing code used by Xen (Len Brown).

 - Fix for the schedutil cpufreq governor to prevent it from using
   stale raw frequency values in configurations with mutiple CPUs
   sharing one policy object and a cleanup for it reducing its
   overhead slightly (Viresh Kumar).
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