UPSTREAM: Add Haswell Chromeboxes/Chromebase using variant board scheme

Combine existing board google/panther with new ChromeOS devices
mccloud, monroe, tricky, and zako, using their common reference board
(beltino) as a base.

Chromium sources used:
firmware-mccloud-5827.B 65bfee7 [haswell: No need pre-graphics delay...]
firmware-monroe-4921.B 1ac749d [Monroe: Disable KB/MS in ITE8772.]
firmware-tricky-5829.B 2db5322 [haswell: No need pre-graphics delay...]
firmware-zako-5219.B eacedef [haswell: No need pre-graphics delay...]

Existing google/panther board will be removed in a subsequent commit.

Variant setup modeled after google/reef

CQ-DEPEND=CL:414991,CL:415072
BUG=None
BRANCH=None
TEST=None

Signed-off-by: Matt DeVillier <matt.devillier@gmail.com>
Reviewed-on: https://review.coreboot.org/17329
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>

Change-Id: I5d7e0c2551e8b0707841032460c35615cefb2886
Reviewed-on: https://chromium-review.googlesource.com/415073
Commit-Ready: Furquan Shaikh <furquan@chromium.org>
Tested-by: Furquan Shaikh <furquan@chromium.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
42 files changed