firmware: Adding vol up/down ascii definitions

BUG=chrome-os-partner:61275
BRANCH=None
TEST=test vol up/down keys and see if menu changes.

Change-Id: I2213639d530f954f12040b14bf2e5cdeb5c03218
Signed-off-by: Shelley Chen <shchen@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/426408
Reviewed-by: Randall Spangler <rspangler@chromium.org>
2 files changed