Drop stout which has hit AUE (auto-update end)

This board hit AUE in M69 so can be removed.

BUG=chromium:980752
TEST=emerge-sarien sys-apps/mosys

Change-Id: Ide20bb286cd2c8b32b837b3b6aa6c4bb95a112d5
Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/1686419
Legacy-Commit-Queue: Commit Bot <commit-bot@chromium.org>
Reviewed-by: Raul E Rangel <rrangel@chromium.org>
12 files changed