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Similar to ChromeVox, show a sticky notification when Switch Access is
enabled that explains how to disable the feature.

Relnotes: N/A
Bug: 996351
Change-Id: I56546ddfe0d5a4e76eb07e5e55fcdf88ef6b2a1c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2131015
Commit-Queue: Anastasia Helfinstein <anastasi@google.com>
Reviewed-by: David Tseng <dtseng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#756015}