Power management fixes for 5.9-rc4

 - Fix reference counting of operating performance points (OPP)
   tables (Viresh Kumar).

 - Address intel_pstate driver interface issues, mostly related
   to switching operation modes and handling CPU offline and
   online and system-wide suspend/resume with hardware-managed
   P-states (HWP) enabled (Rafael Wysocki).

 - Fix the maximum frequency computation in the intel_pstate driver
   with turbo P-states disabled by the platform firmware and HWP
   enabled (Francisco Jerez).
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