chromeos_config: Re-add "auron-b" to waterfall.

https://chromium-review.googlesource.com/#/c/278017/ accidentally
removed the "auron-b" builder from the ToT waterfall; add it back.

BUG=chrome-os-partner:41546
TEST=`./cbuildbot/chromeos_config_unittest`

Change-Id: I0aa7922b20bb1e1b658935a3239209a84f4e42cd
Reviewed-on: https://chromium-review.googlesource.com/288398
Reviewed-by: Daniel Jacques <dnj@chromium.org>
Trybot-Ready: Daniel Jacques <dnj@chromium.org>
Tested-by: Daniel Jacques <dnj@chromium.org>
2 files changed