powerpc: Fix DMA offset for non-coherent DMA

After Becky's work we can almost have different DMA offsets
between on-chip devices and PCI. Almost because there's a
problem with the non-coherent DMA code that basically ignores
the programmed offset to use the global one for everything.
This fixes it.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

arch/powerpc/lib/dma-noncoherent.c

@@ -203,7 +203,7 @@ __dma_alloc_coherent(size_t size, dma_addr_t *handle, gfp_t gfp)
 		/*
 		 * Set the "dma handle"
 		 */
-		*handle = page_to_bus(page);
+		*handle = page_to_phys(page);
 
 		do {
 			BUG_ON(!pte_none(*pte));