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We're disabling the buttons on 83 to mitigate concerns with issues where
users have reported that their devices unintentionally enter tablet mode
(even though they're physically in clamshell). Not showing home and
overview button in those cases would make the issue even worse.

The exception is kukui.

BUG=1084226

Change-Id: I390315dfe8f130a562e085abd51958a649581773
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2207020Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Toni Baržić <tbarzic@chromium.org>
Cr-Commit-Position: refs/heads/master@{#769878}