xfs: drop EXPERIMENTAL tag for large extent counts

This feature has been baking in upstream for ~10mo with no bug reports.
It seems to work fine here, let's get rid of the scary warnings?
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Dave Chinner <dchinner@redhat.com>

fs/xfs/xfs_super.c

@@ -1687,10 +1687,6 @@ xfs_fs_fill_super(
 		goto out_filestream_unmount;
 	}
 
-	if (xfs_has_large_extent_counts(mp))
-		xfs_warn(mp,
-	"EXPERIMENTAL Large extent counts feature in use. Use at your own risk!");
-
 	error = xfs_mountfs(mp);
 	if (error)
 		goto out_filestream_unmount;