Add a few very basic tests and the required key matrix information.
The key matrix is for snow, and the tests are just enough to exercise
the feature.
BUG=chrome-os-partner:12179
BRANCH=none
TEST=manual for now:
On snow:
./ectool keyscan 10000 key_sequence.txt
See that the test passes.
Change-Id: Ibe5a6fe5333102ba7f37be4b526185a48b3c1ae8
Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/35120
Reviewed-by: Randall Spangler <rspangler@chromium.org>
