x86: add free_coherent dma_ops callback to NOMMU driver

	return NULL;

}

static void nommu_free_coherent(struct device *dev, size_t size, void *vaddr,

				dma_addr_t dma_addr)

{

	free_pages((unsigned long)vaddr, get_order(size));

}

struct dma_mapping_ops nommu_dma_ops = {

	.alloc_coherent = nommu_alloc_coherent,

	.free_coherent = nommu_free_coherent,

	.map_single = nommu_map_single,

	.map_sg = nommu_map_sg,

	.is_phys = 1,