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Certain chromebooks now come with panels that have integrated privacy
screens on them. This CL exposes an API in DisplayConfigurator to
set the KMS property, privacy-screen, to the desired state.

Bug: b/147451643
Test: tested locally on a test device
Change-Id: Iafa61365ce20c147eaa672cf33d8d3c6104bcb89
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2015648
Commit-Queue: Gil Dekel <gildekel@chromium.org>
Reviewed-by: Daniel Nicoara <dnicoara@chromium.org>
Reviewed-by: Daniele Castagna <dcastagna@chromium.org>
Reviewed-by: Robert Sesek <rsesek@chromium.org>
Cr-Commit-Position: refs/heads/master@{#735158}