nami: add additional sign_type

Need to add sign_type for factory shim as factory branch not yet
been branched. To be removed once factory branch is created.

BUG=None
TEST=None

Change-Id: I630e192cd9d018a2ebb4c8abf2e6d6e1b50f1390
Reviewed-on: https://chromium-review.googlesource.com/1016160
Commit-Ready: YH Lin <yueherngl@chromium.org>
Tested-by: YH Lin <yueherngl@chromium.org>
Reviewed-by: Marco Chen <marcochen@chromium.org>
2 files changed