[Design] PSU firmware update

[Lei YU]

> >The PSU firmware code update will re-use the current interfaces to upload,
> >verify, and activate the image.
>
> We would like the option to be able to ship the PSU firmware as part of
> the BMC image (in the root filesystem). This means that it is already
> present and authenticated when the BMC boots. In this way, we know that
> the current BMC firmware plays well with the PSU firmware and have fewer
> variables to test for when making a release.

Because the PSU firmware is part of BMC image, this seems a completely
different approach, and more like part of BMC image update, is it?
I would expect this should not be part of this design, what do you think?

>
> I suppose this could be done by skipping the download phase and simply
> creating an activation object at boot and then initiating the FW
> activation automatically.