scsi: qla2xxx: Remove non functional code

Remove code which has no functional use anymore since commit 3c75ad1d
("scsi: qla2xxx: Remove defer flag to indicate immeadiate port loss").

While at it remove also the stale function documentation.

Link: https://lore.kernel.org/r/20200206135443.110701-1-dwagner@suse.de


Reviewed-by: Arun Easi <aeasi@marvell.com>
Reviewed-by: Lee Duncan <lduncan@suse.com>
Signed-off-by: Daniel Wagner <dwagner@suse.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>