Power management fixes for 5.8-rc3

 - Make sure that the _TIF_POLLING_NRFLAG is clear before entering
   the last phase of suspend-to-idle to avoid wakeup issues on some
   x86 systems (Chen Yu, Rafael Wysocki).

 - Cover one more case in which the intel_pstate driver should let
   the platform firmware control the CPU frequency and refuse to
   load (Srinivas Pandruvada).

 - Add __init annotations to 2 functions in the power management
   core (Christophe JAILLET).
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