scsi: smartpqi: minor driver cleanup

 - remove debug code that is no longer necessary.
   - Some WARN_ON checks were removed because the driver continues
     to function when the conditions are met.
 - remove a MACRO that is no longer used.
 - remove unnecessary multi-line statements.

Reviewed-by: Scott Benesh <scott.benesh@microsemi.com>
Signed-off-by: Kevin Barnett <kevin.barnett@microsemi.com>
Signed-off-by: Don Brace <don.brace@microsemi.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>