ARM: 5857/1: ARM: dmabounce: fix build

Commit f74f7e57 (ARM: use
flush_kernel_dcache_area() for dmabounce) has broken dmabounce build:

  CC      arch/arm/common/dmabounce.o
arch/arm/common/dmabounce.c: In function 'unmap_single':
arch/arm/common/dmabounce.c:315: error: implicit declaration of function '__cpuc_flush_kernel_dcache_area'
make[2]: *** [arch/arm/common/dmabounce.o] Error 1

Fix it.
Signed-off-by: Mike Rapoport <mike@compulab.co.il>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

arch/arm/common/dmabounce.c

@@ -312,7 +312,7 @@ static inline void unmap_single(struct device *dev, dma_addr_t dma_addr,
 			 * we need to ensure that the data will be coherent
 			 * with user mappings.
 			 */
-			__cpuc_flush_kernel_dcache_area(ptr, size);
+			__cpuc_flush_dcache_area(ptr, size);
 		}
 		free_safe_buffer(dev->archdata.dmabounce, buf);
 	}