scsi: qla2xxx: Move FCE Trace buffer allocation to user control

Currently FCE Tracing is enabled to log additional ELS events. Instead,
user will enable or disable this feature through debugfs.

Modify existing DFS knob to allow user to enable or disable this
feature.

echo [1 | 0] > /sys/kernel/debug/qla2xxx/qla2xxx_??/fce
cat  /sys/kernel/debug/qla2xxx/qla2xxx_??/fce

Cc: stable@vger.kernel.org
Fixes: df613b96 ("[SCSI] qla2xxx: Add Fibre Channel Event (FCE) tracing support.")
Signed-off-by: Quinn Tran <qutran@marvell.com>
Signed-off-by: Nilesh Javali <njavali@marvell.com>
Link: https://lore.kernel.org/r/20241115130313.46826-4-njavali@marvell.com


Reviewed-by: Himanshu Madhani <himanshu.madhani@oracle.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>