scsi: aacraid: Fix 2T+ drives on SmartIOC-2000

The logic for supporting large drives was previously tied to 4Kn support
for SmartIOC-2000. As SmartIOC-2000 does not support volumes using 4Kn
drives, use the intended option flag AAC_OPT_NEW_COMM_64 to determine
support for volumes greater than 2T.

Cc: <stable@vger.kernel.org>
Signed-off-by: Dave Carroll <david.carroll@microsemi.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Raghava Aditya Renukunta <RaghavaAditya.Renukunta@microsemi.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>