Power management fixes for 5.15-rc2

 - Prevent intel_pstate from avoiding to use HWP, even if instructed
   to do so via the kernel command line, when HWP has been enabled
   already by the platform firmware (Doug Smythies).

 - Prevent use-after-free from occurring in the schedutil cpufreq
   governor on exit by fixing a core helper function that attempts
   to access memory associated with a kobject after calling
   kobject_put() on it (James Morse).
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