md: rename "mdk_personality" to "md_personality"

"mdk" doesn't mean anything any more.

Signed-off-by: NeilBrown <neilb@suse.de>
diff --git a/drivers/md/md.h b/drivers/md/md.h
index b618da5..51c1d91 100644
--- a/drivers/md/md.h
+++ b/drivers/md/md.h
@@ -184,7 +184,7 @@
 
 struct mddev {
 	void				*private;
-	struct mdk_personality		*pers;
+	struct md_personality		*pers;
 	dev_t				unit;
 	int				md_minor;
 	struct list_head 		disks;
@@ -413,7 +413,7 @@
         atomic_add(nr_sectors, &bdev->bd_contains->bd_disk->sync_io);
 }
 
-struct mdk_personality
+struct md_personality
 {
 	char *name;
 	int level;
@@ -551,8 +551,8 @@
 	if (p) put_page(p);
 }
 
-extern int register_md_personality(struct mdk_personality *p);
-extern int unregister_md_personality(struct mdk_personality *p);
+extern int register_md_personality(struct md_personality *p);
+extern int unregister_md_personality(struct md_personality *p);
 extern struct md_thread *md_register_thread(
 	void (*run)(struct mddev *mddev),
 	struct mddev *mddev,