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

This board hit AUE in M72 so can be removed.

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

Change-Id: I191c1c4d40255ca035e763819079b9b688271385
Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/1686423
Legacy-Commit-Queue: Commit Bot <commit-bot@chromium.org>
Reviewed-by: Raul E Rangel <rrangel@chromium.org>
10 files changed