Power management material for 5.1-rc4

 - Make intel_pstate only load on Intel processors and prevent it
   from printing pointless failure messages (Borislav Petkov).

 - Update the turbostat utility:
   * Assorted fixes (Ben Hutchings, Len Brown, Prarit Bhargava).
   * Support for AMD Fam 17h (Zen) RAPL and package power (Calvin
     Walton).
   * Support for Intel Icelake and for systems with more than one
     die per package (Len Brown).
   * Cleanups (Len Brown).
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