hptiop(4): Add the hptiop(4) RAID driver.
The driver supports the following adapters:
* HighPoint RocketRAID 3020
* HighPoint RocketRAID 3120
* HighPoint RocketRAID 3122
* HighPoint RocketRAID 3220
* HighPoint RocketRAID 3320
* HighPoint RocketRAID 3410
* HighPoint RocketRAID 3510
* HighPoint RocketRAID 3511
* HighPoint RocketRAID 3520
* HighPoint RocketRAID 3521
* HighPoint RocketRAID 3522
* HighPoint RocketRAID 3540
* HighPoint RocketRAID 4320
It was tested with the 3120.
Many thanks to FreeBSD, from which this code was obtained.