Remove dma_cache_(wback|inv|wback_inv) functions

dma_cache_(wback|inv|wback_inv) were the earliest attempt on a generalized
cache managment API for I/O purposes.  Originally it was basically the raw
MIPS low level cache API exported to the entire world.  The API has
suffered from a lack of documentation, was not very widely used unlike it's
more modern brothers and can easily be replaced by dma_cache_sync.  So
remove it rsp.  turn the surviving bits back into an arch private API, as
discussed on linux-arch.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Acked-by: Paul Mundt <lethal@linux-sh.org>
Acked-by: Paul Mackerras <paulus@samba.org>
Acked-by: David S. Miller <davem@davemloft.net>
Acked-by: Kyle McMartin <kyle@parisc-linux.org>
Acked-by: Haavard Skinnemoen <hskinnemoen@atmel.com>
Cc: <linux-arch@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

arch/avr32/mm/dma-coherent.c

@@ -21,13 +21,13 @@ void dma_cache_sync(struct device *dev, void *vaddr, size_t size, int direction)
 
 	switch (direction) {
 	case DMA_FROM_DEVICE:		/* invalidate only */
-		dma_cache_inv(vaddr, size);
+		invalidate_dcache_region(vaddr, size);
 		break;
 	case DMA_TO_DEVICE:		/* writeback only */
-		dma_cache_wback(vaddr, size);
+		clean_dcache_region(vaddr, size);
 		break;
 	case DMA_BIDIRECTIONAL:		/* writeback and invalidate */
-		dma_cache_wback_inv(vaddr, size);
+		flush_dcache_region(vaddr, size);
 		break;
 	default:
 		BUG();