Power management fixes for 5.11-rc3

 - Make the powernow-k8 cpufreq driver avoid calling cpufreq_cpu_get(),
   which theoretically may return NULL, to get a policy pointer that
   is known to it already (Colin Ian King).

 - Drop two functions that are not used any more from the intel_pstate
   driver (Lukas Bulwahn).

 - Make intel_pstate check the HWP capabilities to get the maximum
   available P-state in the passive mode to avoid using a stale value
   of it in case of out-of-band updates (Rafael Wysocki).
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