Pull up following revision(s) via patch (requested by msaitoh in ticket #1454):
sys/dev/ic/mfi.c: revisions 1.63, 1.66-77
sys/dev/ic/mfireg.h: revisions 1.11-1.20 via patch
sys/dev/pci/mfi_pci.c: revision 1.21
sys/dev/pci/mfii.c: revisions 1.6-1.7, 1.10-1.15
share/man/man4/mfi.4: revision 1.13

Improve mfi(4) and mfii(4):
- Set 'ld_sync' to NULL as part of 'again', to prevent use-after-free.
- Add some code for the SKINNY variant to make Dell PERC H310 work.
- Print the percentage correctly when the background initialization is
  running.
- Clear mailbox to not to pass garbage data.
- Use union mbox instead of unit8_t xxx[] to avoid unaligned access.
- Set stripe size for BIOCVOL to show the size correctly in bioctl.
- Add support for iBBU-09 to show BBU voltage, current and temperature
  correctly.
- Fix typos in comments.
- Sprinkle static.
- Improve debug printf()s.
- KNF. Remove extra semicolon. Whitespace fixes.

(bouyer)