cros_ec: Add cros_ec_build_info and callback

Wilco does not expose the fw version via the RO or RW version like a
standard CROS EC. Instead we will use the build info.

The function is marked as unused because it will be used in the next cl.

TEST=mosys ish info on Sarien

Change-Id: I3500b076d0c8ba63a732e0fd4b636a2a92e3f9da
Signed-off-by: Raul E Rangel <>
Commit-Ready: ChromeOS CL Exonerator Bot <>
Legacy-Commit-Queue: Commit Bot <>
Reviewed-by: Jett Rink <>
3 files changed