patches/RELENG_8_3: Update sys/dev/mfi patch

- Minor sync with upstream commit as denoted in Readme
- Remove modifications to the 'mps' - if we'd have them,
  they should be included in patches for this module, not mfi.
Merge pull request #97 from matsimon/mfi-sync

patches/RELENG_8_3: Update sys/dev/mfi patch