[Bug 240485] ig4: Add Cannon Lake LP and H I2C Controller IDs

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=240485

--- Comment #4 from Vladimir Kondratyev <wulf at freebsd.org> ---
(In reply to Neel Chauhan from comment #3)
> If this code exists in FreeBSD, where is it?

Not in vanilla sources yet. Clock registers in FreeBSD ig4 driver are still
tuned to support Mathew Dillon's Haswell? chromebook only  but they should be
tuned for each controller model separately based on its IC clock rate.
Thanks to separate clock line, I2C bus is not very sensitive to timing
deviations and Haswell clock values still works sometimes. Only sometimes, so
this part must be improved.

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