Power management fixes for 6.4-rc3

 - Get rid of a warning message printed by the ACPI cpufreq driver
   after recent changes in it when anohter CPU performance scaling
   driver is registered already when it starts (Petr Pavlu).

 - Make cpupower read TSC on each CPU right before reading MPERF so as
   to reduce the potential time difference between the TSC and MPERF
   accesses and improve the C0 percentage calculation (Wyes Karny).

 - Fix a possible file handle leak and clean up the code in the
   sysfs_get_enabled() function in cpupower (Hao Zeng).
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