[CrOS MultiDevice] Update OWNERS files with correct component.

Also point to a single master OWNERS file.

Change-Id: I019063d57da599b4e25b5429e0882e0000baa4ee
Reviewed-on: https://chromium-review.googlesource.com/c/1370858
Reviewed-by: Dan Beam <dbeam@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Commit-Queue: Ryan Hansberry <hansberry@chromium.org>
Cr-Commit-Position: refs/heads/master@{#616505}
18 files changed