microblaze: use sg_phys()

Use sg_phys() instead of open-coding it.
Signed-off-by: NGeliang Tang <geliangtang@gmail.com>
Signed-off-by: NMichal Simek <michal.simek@xilinx.com>

arch/microblaze/kernel/dma.c

@@ -65,8 +65,7 @@ static int dma_direct_map_sg(struct device *dev, struct scatterlist *sgl,
 		if (attrs & DMA_ATTR_SKIP_CPU_SYNC)
 			continue;
 
-		__dma_sync(page_to_phys(sg_page(sg)) + sg->offset,
-							sg->length, direction);
+		__dma_sync(sg_phys(sg), sg->length, direction);
 	}
 
 	return nents;