qla2xxx: Move atioq to a different lock to reduce lock contention

qla2xxx: Move atioq to a different lock to reduce lock contention

Orabug: 26844197, 26923029

 99% of the time the ATIOQ has SCSI command.  The other 1% of time
 is something else.  Most of the time this interrupt does not need
 to hold the hardware_lock.  We're moving the ATIO interrupt thread
 to a different lock to reduce lock contention.

 Signed-off-by: Quinn Tran <quinn.tran@qlogic.com>
 Signed-off-by: Himanshu Madhani <himanshu.madhani@qlogic.com>
 Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
Signed-off-by: Brian Maly <brian.maly@oracle.com>
Reviewed-by: Jack Vogel <jack.vogel@oracle.com>