Update mps(4) via 8-STABLE

Since we ship an updated mfi(4) from 8-STABLE, it may be meaningful
to also suck in the updates to the HBA-only models from LSI.
(some HBA/RAID cards are cross-flashable between operational modes)

While this doesn't explicitely add new hardware support, changelogs indicate
bug fixes like memory leaks one may be happy to see in production.

As with mfi(3) this wraps all changes into one large patch obtained
from cherry picks via 8-STABLE applied on a clean 8.3-RELENG branch.

See the readme to get an idea what is included (hopefully helpful for later merges)
The result compiled on a vanilla 8.3, the module has to be built into the kernel for bootability.
I don't expect this to be needed in embedded installes, no need to change the kernel configs for them.