scsi: qla2xxx: Make it explicit that ELS pass-through IOCBs use little endian

According to the firmware documentation the firmware expects all ELS
pass-through IOCB parameters in little endian format. Make this explicit.

Cc: Himanshu Madhani <hmadhani@marvell.com>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Tested-by: Himanshu Madhani <hmadhani@marvell.com>
Reviewed-by: Himanshu Madhani <hmadhani@marvell.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>