G/C struct znode -> z_moved

The field is yet another leftover from unsupported zfs_znode_move.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Ryan Moeller <ryan@iXsystems.com>
Signed-off-by: Mateusz Guzik <mjguzik@gmail.com>
Closes #11186

include/sys/zfs_znode.h

@@ -187,7 +187,6 @@ typedef struct znode {
 	boolean_t	z_unlinked;	/* file has been unlinked */
 	boolean_t	z_atime_dirty;	/* atime needs to be synced */
 	boolean_t	z_zn_prefetch;	/* Prefetch znodes? */
-	boolean_t	z_moved;	/* Has this znode been moved? */
 	boolean_t	z_is_sa;	/* are we native sa? */
 	boolean_t	z_is_mapped;	/* are we mmap'ed */
 	boolean_t	z_is_ctldir;	/* are we .zfs entry */