Add unit tests for tpm_bootmode

BUG=chromium-os:17564
TEST=make && make runtests

Change-Id: I6437e41f55d5b705a3768d325999847c5753a13d
Reviewed-on: http://gerrit.chromium.org/gerrit/6627
Reviewed-by: Stefan Reinauer <reinauer@google.com>
Tested-by: Randall Spangler <rspangler@chromium.org>
2 files changed