Update freon board list to include falco, leon, wolf

BUG=chromium:454515
TEST=none
CQ-DEPEND=CL:245592

Change-Id: If167ef88b77783cd21883c7644b6fc513c52875a
Reviewed-on: https://chromium-review.googlesource.com/245600
Tested-by: Michael Spang <spang@chromium.org>
Reviewed-by: Michael Spang <spang@chromium.org>
Commit-Queue: Michael Spang <spang@chromium.org>
Trybot-Ready: Michael Spang <spang@chromium.org>
(cherry picked from commit 1bb3f2e8618d6045e415ff0c3bae70c41fffc117)
Reviewed-on: https://chromium-review.googlesource.com/255932
2 files changed