scsi: smartpqi: Enhance controller offline notification

Add a description for the reason the controller has been taken off-line.

Reviewed-by: Scott Benesh <scott.benesh@microchip.com>
Reviewed-by: Scott Teel <scott.teel@microchip.com>
Reviewed-by: Mike McGowen <mike.mcgowen@microchip.com>
Signed-off-by: David Strahan <David.Strahan@microchip.com>
Signed-off-by: Don Brace <don.brace@microchip.com>
Link: https://lore.kernel.org/r/20230824155812.789913-7-don.brace@microchip.com


Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>