md: move headers out of include/linux/raid/

Move the headers with the local structures for the disciplines and
bitmap.h into drivers/md/ so that they are more easily grepable for
hacking and not far away.  md.h is left where it is for now as there
are some uses from the outside.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: NeilBrown <neilb@suse.de>
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index a5ba080..f75698b 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -44,10 +44,9 @@
  */
 
 #include <linux/kthread.h>
-#include "raid6.h"
-
-#include <linux/raid/bitmap.h>
 #include <linux/async_tx.h>
+#include "raid6.h"
+#include "bitmap.h"
 
 /*
  * Stripe cache