[Bug 221777] merge the latest changes to the ig4 module from DragonFly BSD and add Kaby Lake / Intel 100 series platform support

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=221777

--- Comment #17 from commit-hook at freebsd.org ---
A commit references this bug:

Author: gonzo
Date: Mon Aug 13 18:53:15 UTC 2018
New revision: 337719
URL: https://svnweb.freebsd.org/changeset/base/337719

Log:
  [ig4] Fix initialization sequence for newer ig4 chips

  Newer chips may require assert/deassert after power down for proper
  startup. Check respective flag in DEVIDLE_CTRL and perform operation
  if neccesssary.

  PR:           221777
  Submitted by: marc.priggemeyer at gmail.com
  Obtained from:        DragonFly BSD
  Tested on:    Thinkpad T470

Changes:
  head/sys/dev/ichiic/ig4_iic.c
  head/sys/dev/ichiic/ig4_reg.h

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