system: Add hwid_database_version to SystemInfo

Adds hwid_database_version to SystemInfo. It is the checksum calculated
by hwid_utils.ComputeDatabaseCheck and can be used to identify the hwid
database version.

BUG=chrome-os-partner:25791
TEST=boot and check goofy SystemInfo labels.

Change-Id: I2b4b5b9868226771e5fe48cdfb2398911e74158d
Reviewed-on: https://chromium-review.googlesource.com/200421
Reviewed-by: Ricky Liang <jcliang@chromium.org>
Commit-Queue: Cheng-Yi Chiang <cychiang@chromium.org>
Tested-by: Cheng-Yi Chiang <cychiang@chromium.org>
2 files changed