Add part number to Physical Memory for macOS, AIX

[dbwiddis]

Fixes #2607

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.27%. Comparing base (e7efd02) to head (c301691).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2625   +/-   ##
=======================================
  Coverage   85.27%   85.27%           
=======================================
  Files          30       30           
  Lines        1338     1338           
  Branches      189      189           
=======================================
  Hits         1141     1141           
  Misses        114      114           
  Partials       83       83           

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