[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 #6 from Oleksandr Tymoshenko <gonzo at FreeBSD.org> ---
(In reply to Daniel from comment #5)

The board I used for tests has BIOS option to switch I2C controllers between
ACPI and PCI mode. In PCI mode ig4 works as expected in ACPI mode attach fails
with the same error. I didn't have time to investigate it popery yet. As a
workaround you can check for something like this in your device's BIOS. 

Could you also post the output of acpidump -dt here? It may be useful.

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