Add FreeBSD's mpr(4) driver for LSI Fusion-MPT 3/3.5 SAS controllers.

This commit also includes a userland utility for mps(4) and mpr(4)
(mprutil(8) aka mpsutil(8)).

After porting bug fixing, testi

Add FreeBSD's mpr(4) driver for LSI Fusion-MPT 3/3.5 SAS controllers.

This commit also includes a userland utility for mps(4) and mpr(4)
(mprutil(8) aka mpsutil(8)).

After porting bug fixing, testing shows that it seems to be stable,
therefore I have added it to our X64_64_GENERIC as well.

Thanks to zrj for testing and to sephe for some porting clues.

Taken-from: FreeBSD

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