[POWERPC] ppc4xx_sgdma needs dma-mapping.h

For dma_alloc_*()

Cc: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NPaul Mackerras <paulus@samba.org>

arch/ppc/syslib/ppc4xx_sgdma.c

@@ -27,6 +27,7 @@
 
 #include <asm/system.h>
 #include <asm/io.h>
+#include <asm/dma-mapping.h>
 #include <asm/ppc4xx_dma.h>
 
 void