rowan cr50 changes

Signed-off-by: Vadim Bendebury <vbendeb@chromium.org>

BRANCH=none
BUG=b:36786804
TEST=Boot rowan w/ serial enabled, verify depthcharge sees "cr50 TPM"

Change-Id: I8868a395da8f3688839c2ea96ea3089ab061cad8
Reviewed-on: https://chromium-review.googlesource.com/442405
Commit-Ready: Daniel Kurtz <djkurtz@chromium.org>
Tested-by: Daniel Kurtz <djkurtz@chromium.org>
Reviewed-by: Julius Werner <jwerner@chromium.org>
2 files changed