firmware: Update version messages

The separated-into-parts version messages still need some refinement.
For now, just provide strings to allow mapping between the two
versioning styles.

BUG=b:180008611
TEST=generate

Change-Id: I5524f2d28d238bef481dc86e3ff90de9b5052db4
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/infra/proto/+/2753887
Reviewed-by: Jett Rink <jettrink@chromium.org>
Reviewed-by: Alex Klein <saklein@chromium.org>
Commit-Queue: LaMont Jones <lamontjones@chromium.org>
2 files changed