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

Commit f74f7e57ae9fa12b2951ae62ce3557799b318399 (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 <[e-mail]>
Signed-off-by: Russell King <[e-mail]>

arch/arm/common/dmabounce.c

···
 			 * 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);
 	}