Oak: Add basic board support

This adds some basic functions for supporting Oak platform, including
ec, memory, nvram, platform, psu, etc.

BRANCH=none
BUG=chrome-os-partner:37405
TEST=mosys runs on Oak

Change-Id: I956176fef7c9ccd6d0bd5f0984fbdeda3b12e768
Signed-off-by: Milton Chiang <milton.chiang@mediatek.com>
Reviewed-on: https://chromium-review.googlesource.com/266975
Reviewed-by: David Hendricks <dhendrix@chromium.org>
12 files changed