mosys: initial implementation of cheza support

Add basics of mosys support for cheza. This isn't completed, the
memory, ec and eeprom code is not complete. The platform config
information looks good.

BUG=b:112001885
TEST=local build and deployment to cheza, tryjob
CQ-DEPEND=CL:1204695

Change-Id: Ibefaf7602dd4a2732719df6290295d7a9689cc26
Reviewed-on: https://chromium-review.googlesource.com/1207693
Commit-Ready: Gregory Meinke <gmeinke@chromium.org>
Tested-by: Gregory Meinke <gmeinke@chromium.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
8 files changed