The support/ dir has only ever been used to host a single CrOS file.
We can move that to `cros` (which is the primary tool in the CrOS
world), and have the few other wrapped programs point to that.

Bug: None
Change-Id: I3ba3cc7375d357d62fb464e1b6dc37e73bc83cb5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/1876639Reviewed-by: Nodir Turakulov <nodir@chromium.org>
Commit-Queue: Mike Frysinger <vapier@chromium.org>