cbuildbot_config: Update groups for M41 release.

In anticipation of M41 releases, define some new board groupings:
- ivybridge: +link
- veyron (new): +veyron_[pinky, jerry, mighty, speedy]
- beltino-freon (new): +[mccloud, monroe, panther, tricky]_freon
- beltino-freon-b (new): +zako_freon

Some ChromeOS waterfall reorganization will need to happen for
'ivybridge' to avoid duplication. Can also consolidate builders for the
other groups!

  - New configurations look correct.

Change-Id: I2341c91385df9746cf64e87a090d604fedd3a2b0
Reviewed-on: https://chromium-review.googlesource.com/239233
Reviewed-by: Daniel Jacques <dnj@chromium.org>
Commit-Queue: Daniel Jacques <dnj@chromium.org>
Tested-by: Daniel Jacques <dnj@chromium.org>
2 files changed