[Bug 212020] Add powerd(8) support for newer AMD CPUs

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=212020

            Bug ID: 212020
           Summary: Add powerd(8) support for newer AMD CPUs
           Product: Base System
           Version: CURRENT
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: Scoobi_doo at yahoo.com
                CC: freebsd-amd64 at FreeBSD.org
                CC: freebsd-amd64 at FreeBSD.org

Created attachment 173900
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=173900&action=edit
Patch to add powerd/cpufreq support for newer AMD CPUs.

sys/x86/cpufreq/hwpstate.c provides support for AMD CPUs, but only
supports families up to 0x11.  The latest AMD CPU family is 0x16.  This
patch adds support for newer AMD CPUs.  (The patch to
sys/x86/cpufreq/powernow.c is cosmetic/superfluous.)

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