move stout out of platform/experimental/

Stout is no longer experimental :-)

BRANCH=none
BUG=none
TEST=compiled and run on Stout

Change-Id: Ib01ffcbed51a6587073b7dacce1d73e9afcd368a
Reviewed-on: https://gerrit.chromium.org/gerrit/41855
Commit-Queue: David Hendricks <dhendrix@chromium.org>
Reviewed-by: David Hendricks <dhendrix@chromium.org>
Tested-by: David Hendricks <dhendrix@chromium.org>
18 files changed