nyan: Add a stub mainboard.

BUG=None
TEST=With this and other changes, built for the nyan board.
BRANCH=None

Change-Id: Icdde4cf5e1abb3ae1ad14279ebc129919ba30074
Signed-off-by: Gabe Black <gabeblack@google.com>
Reviewed-on: https://chromium-review.googlesource.com/170837
Reviewed-by: Gabe Black <gabeblack@chromium.org>
Commit-Queue: Gabe Black <gabeblack@chromium.org>
Tested-by: Gabe Black <gabeblack@chromium.org>
6 files changed