mps: Properly define U32 and S32

mps(4): Sync with FreeBSD.

This a still in progress port of the new, LSI-supported version of the
mps(4) driver from FreeBSD.

Some of the changes are (from FreeBSD's commit msg):

- Integrated RAID

mps(4): Sync with FreeBSD.

This a still in progress port of the new, LSI-supported version of the
mps(4) driver from FreeBSD.

Some of the changes are (from FreeBSD's commit msg):

- Integrated RAID (IR) support.
- Support for WarpDrive controllers.
- Support for SCSI protection information (EEDP).
- Support for TLR (Transport Level Retries), needed for tape drives.
- Improved error recovery code.
- ioctl interface compatible with LSI utilities.

This commit also moves the driver from sys/dev/disk to sys/dev/raid.

It still fails attaching at this stage. Work on it will continue in
master.

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