xfs: fix duplicate includes

Header files were already included, just not in the normal order.
Remove the duplicates, preserving normal order. Also move xfs_ag.h
include to before the scrub internal includes which are normally
last in the include list.

Fixes: d5c88131 ("xfs: allow queued AG intents to drain before scrubbing")
Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Dave Chinner <david@fromorbit.com>

fs/xfs/scrub/refcount.c

@@ -9,6 +9,7 @@
 #include "xfs_format.h"
 #include "xfs_trans_resv.h"
 #include "xfs_mount.h"
+#include "xfs_ag.h"
 #include "xfs_btree.h"
 #include "xfs_rmap.h"
 #include "xfs_refcount.h"
@@ -16,9 +17,6 @@
 #include "scrub/common.h"
 #include "scrub/btree.h"
 #include "scrub/trace.h"
-#include "xfs_trans_resv.h"
-#include "xfs_mount.h"
-#include "xfs_ag.h"
 
 /*
  * Set us up to scrub reference count btrees.