target: remove unused lun_flags field from se_lun

The lun_flags field is not used, so drop it.
Signed-off-by: NChris Zankel <czankel@purestorage.com>
Signed-off-by: NSpencer Baugh <spencer.baugh@purestorage.com>
Reviewed-by: NChristoph Hellwig <hch@lst.de>
Signed-off-by: NNicholas Bellinger <nab@linux-iscsi.org>

include/target/target_core_base.h

@@ -680,7 +680,6 @@ struct se_lun {
 #define SE_LUN_LINK_MAGIC			0xffff7771
 	u32			lun_link_magic;
 	u32			lun_access;
-	u32			lun_flags;
 	u32			lun_index;
 
 	/* RELATIVE TARGET PORT IDENTIFER */