scsi: aacraid: Merge func to get container information

Merge aac_get_containers to setup target function, so that information
about all the present devices can be retrieved in one shot.

Signed-off-by: Raghava Aditya Renukunta <RaghavaAditya.Renukunta@microsemi.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>