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This change is in preparation for ChromeVox bluetooth braille support.

Bug: 882261,899052
Test: call chrome.bluetooth.startDiscovery(); obtain address to bt braille display; chrome.bluetoothPrivate.connect(); verify ChromeVox displays braille over bt after restarting brltty with -d "bluetooth:<addrr>".
Change-Id: I4df43484de9d4bacd05d72fa6406820ee7c0aa2d
Reviewed-on: https://chromium-review.googlesource.com/c/1299577Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Reviewed-by: Yuki Awano <yawano@chromium.org>
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Commit-Queue: David Tseng <dtseng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#603125}