factory_install: Clear TPM in end of installation.

For some devices, installation may clear NV data so we want to clear TPM again.

BUG=chrome-os-partner:33670
TEST=manually verified.

Change-Id: Ia33110072dc1ddb2d9629994283f48ab2c5f9aea
Reviewed-on: https://chromium-review.googlesource.com/235673
Reviewed-by: Hung-Te Lin <hungte@chromium.org>
Commit-Queue: Hung-Te Lin <hungte@chromium.org>
Tested-by: Hung-Te Lin <hungte@chromium.org>
1 file changed