ppc64: Fix typo in iommu cleanups that broke pmac build.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>

include/asm-ppc64/dart.h

@@ -51,9 +51,9 @@
 #define DARTMAP_RPNMASK 0x00ffffff
 
 
-#define DART_SHIFT		12
+#define DART_PAGE_SHIFT		12
-#define DART_PAGE_SIZE		(1 << DART_SHIFT)
+#define DART_PAGE_SIZE		(1 << DART_PAGE_SHIFT)
-#define DART_PAGE_FACTOR	(PAGE_SHIFT - DART_SHIFT)
+#define DART_PAGE_FACTOR	(PAGE_SHIFT - DART_PAGE_SHIFT)
 
 
 #endif