Power management fixes for 5.16-rc4

 - Disable DTPM for this cycle to prevent it from causing issues
   to appear on otherwise functional systems (Daniel Lezcano).

 - Fix cpufreq sysfs interface failure related to physical CPU
   hot-add (Xiongfeng Wang).

 - Fix comment in cpufreq core and update its documentation (Tang
   Yizhou).
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