[SCSI] cxgb3i: fix can_queue and cmd_per_lun initialization

cxgb3i was setting can_queue to only 128 commands, and was
setting the can_queue and cmd_per_lun to the same value.

This sets the can_queue to 1024 commands, and sets the cmd_per_lun
to a safer default of 32.

Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>