[SCSI] bnx2i: Modified to skip CNIC registration if iSCSI is not supported

The init routine will now examine the cnic->max_iscsi_conn variable
before registering to CNIC during ulp_init.

Signed-off-by: Eddie Wai <eddie.wai@broadcom.com>
Acked-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>