CHERRY-PICK: Add disk_layout.json and legacy_disk_layout.json to Mccloud

BUG=chrome-os-partner:29527
TEST=Run setup_board, build_packages and build_image for board=mccloud

Change-Id: Id5da3a9f067711f1672000e5903fe2b5f1713d37
Original-Change-Id: Icf120d6315a0bb63efabcdbcaba331e456da5f62
Reviewed-on: https://chromium-review.googlesource.com/203356
Tested-by: Shan-fu Chiou <shan-fu.chiou@intel.com>
Reviewed-by: Mohammed Habibulla <moch@chromium.org>
Commit-Queue: Shan-fu Chiou <shan-fu.chiou@intel.com>
(cherry picked from commit 11e3320f53db671e67d30cfb30b9383ee31f0e9d)
Reviewed-on: https://chromium-review.googlesource.com/203601
2 files changed