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This CL just adds the enum for the command to the command proto.

DD for the feature go/remote-powerwash-command

Bug: 827523
Change-Id: Iaaa3e30ca0212039120bc36b5763ad6fb789ee37
Reviewed-on: https://chromium-review.googlesource.com/1246790Reviewed-by: Julian Pastarmov <pastarmovj@chromium.org>
Commit-Queue: Ivan Šandrk <isandrk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#595404}