Return MD_SB_CLUSTERED if mddev is clustered

Signed-off-by: Goldwyn Rodrigues <rgoldwyn@suse.com>
diff --git a/include/uapi/linux/raid/md_p.h b/include/uapi/linux/raid/md_p.h
index 49f4210..643489d 100644
--- a/include/uapi/linux/raid/md_p.h
+++ b/include/uapi/linux/raid/md_p.h
@@ -101,6 +101,7 @@
 #define MD_SB_CLEAN		0
 #define MD_SB_ERRORS		1
 
+#define	MD_SB_CLUSTERED		5 /* MD is clustered */
 #define	MD_SB_BITMAP_PRESENT	8 /* bitmap may be present nearby */
 
 /*