buffet: Populate firmwareVersion

BUG=brillo:103
TEST=buffet_BasicDBusAPI confirms this works as intended.
Change-Id: I90e3da7f7a4fd7901e4a605413d81cbd14a43d09
Reviewed-on: https://chromium-review.googlesource.com/247234
Tested-by: Christopher Wiley <wiley@chromium.org>
Reviewed-by: Alex Vakulenko <avakulenko@chromium.org>
Commit-Queue: Christopher Wiley <wiley@chromium.org>
1 file changed
tree: d70d7b436d22e60e2f9fe82ac161126de08ffc50
  1. buffet/