default_remotes: Update toolchain DUT names

BUG=b:153872557
TEST=None

Change-Id: Ibc9f16d253ee9bd113fc654846462e647dc0594c
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/toolchain-utils/+/2327953
Tested-by: Tiancong Wang <tcwang@google.com>
Reviewed-by: George Burgess <gbiv@chromium.org>
Commit-Queue: George Burgess <gbiv@chromium.org>
Auto-Submit: Tiancong Wang <tcwang@google.com>
1 file changed