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chime is a downstream only DFMs, it should be defined downstream only
and not reference clank from the chromium repo.

Followup downstream cl crrev.com/i/3358245

Change-Id: I54b4cc29cbb23c61f654fe86831f0e5c2f512d95
Bug: 1142775
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2495608Reviewed-by: Xing Liu <xingliu@chromium.org>
Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Commit-Queue: Mohamed Heikal <mheikal@chromium.org>
Cr-Commit-Position: refs/heads/master@{#822269}