Catch up various powerpc64 kernel conf things to amd64.
Addressed the two inlines but the overall intent here is to not think about this and follow amd64 GENERIC. When they reduce due to devmatch, we replay the change.
The only real delta now is ixl(4) which I think blows up gcc and mpr(4) which we need but has endian or other issues.
I don't think this is probe-able. A SAS tape library would be a modern use.
This is standard fare on servers
It's so ubiquitous we see it on lots of (admittedly x86) ahci attachments: