[PATCH] powerpc: Move dart.h

asm-ppc64/dart.h is included in exactly one place -
arch/powerpc/sysdev/u3_iommu.c.  This patch, therefore, moves it into
arch/powerpc/sysdev.  While we're at it, update the #ifndef/#define
protecting the include, and the filename in the comments of
u3_iommu.c.

Built and booted on pSeries and G5, built for ppc32 powermac.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>
diff --git a/arch/powerpc/sysdev/u3_iommu.c b/arch/powerpc/sysdev/u3_iommu.c
index fba871a..6077221 100644
--- a/arch/powerpc/sysdev/u3_iommu.c
+++ b/arch/powerpc/sysdev/u3_iommu.c
@@ -1,5 +1,5 @@
 /*
- * arch/ppc64/kernel/u3_iommu.c
+ * arch/powerpc/sysdev/u3_iommu.c
  *
  * Copyright (C) 2004 Olof Johansson <olof@austin.ibm.com>, IBM Corporation
  *
@@ -44,9 +44,10 @@
 #include <asm/abs_addr.h>
 #include <asm/cacheflush.h>
 #include <asm/lmb.h>
-#include <asm/dart.h>
 #include <asm/ppc-pci.h>
 
+#include "dart.h"
+
 extern int iommu_force_on;
 
 /* Physical base address and size of the DART table */