powerpc: include lmb.h in arch/powerpc/platforms/powermac/setup.c

since it uses the lmb stuff in one place.
Signed-off-by: Paul Mackerras <paulus@samba.org>

arch/powerpc/platforms/powermac/setup.c

@@ -75,6 +75,7 @@
 #include <asm/smu.h>
 #include <asm/pmc.h>
 #include <asm/mpic.h>
+#include <asm/lmb.h>
 
 #include "pmac.h"