x86: remove map_single and unmap_single in struct dma_mapping_ops

This patch converts dma_map_single and dma_unmap_single to use
map_page and unmap_page respectively and removes unnecessary
map_single and unmap_single in struct dma_mapping_ops.

This leaves intel-iommu's dma_map_single and dma_unmap_single since
IA64 uses them. They will be removed after the unification.

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

drivers/pci/intel-iommu.c

@@ -2582,8 +2582,6 @@ int intel_map_sg(struct device *hwdev, struct scatterlist *sglist, int nelems,
 static struct dma_mapping_ops intel_dma_ops = {
 	.alloc_coherent = intel_alloc_coherent,
 	.free_coherent = intel_free_coherent,
-	.map_single = intel_map_single,
-	.unmap_single = intel_unmap_single,
 	.map_sg = intel_map_sg,
 	.unmap_sg = intel_unmap_sg,
 #ifdef CONFIG_X86_64