ARM: OMAP: Fix consistent_sync()

It looks like consistent_sync() is off by one on arm as the dmac
functions are being called with start and end instead of start and length.

Also posted to linux-arm-kernel mailing list:

http://lists.arm.linux.org.uk/pipermail/linux-arm-kernel/2005-November/032037.html

arch/arm/mm/consistent.c

@@ -432,7 +432,7 @@ core_initcall(consistent_init);
 void consistent_sync(void *vaddr, size_t size, int direction)
 {
 	unsigned long start = (unsigned long)vaddr;
-	unsigned long end   = start + size;
+	unsigned long end   = start + size - 1;
 
 	switch (direction) {
 	case DMA_FROM_DEVICE:		/* invalidate only */