scsi: target: cxgbit: Increase max DataSegmentLength

Current value of max DataSegmentLength is 8K. T5/T6 adapters support
DataSegmentLength upto 16K. Increase max DataSegmentLength.

Link: https://lore.kernel.org/r/1634135087-4996-1-git-send-email-varun@chelsio.com


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