Leon: Add leon board to cros-board.eclass

TEST=run ./build_packages --board=leon from scripts directory
BUG=None

Enable leon build

Change-Id: Ic3fbe55a34fb174919aa7df97e69f5e4f14b45b3
Reviewed-on: https://gerrit.chromium.org/gerrit/66991
Reviewed-by: Gene Chen <gene.chen@intel.com>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Commit-Queue: Yung Leem <yungleem@chromium.org>
Reviewed-by: Yung Leem <yungleem@chromium.org>
Tested-by: Yung Leem <yungleem@chromium.org>
1 file changed