[MIPS] DMA: Fix a bunch of warnings due to missing inline keywords.

struct device;

static dma_addr_t plat_map_dma_mem(struct device *dev, void *addr, size_t size)

static inline dma_addr_t plat_map_dma_mem(struct device *dev, void *addr,

	size_t size)

{

	return virt_to_phys(addr);

}

static dma_addr_t plat_map_dma_mem_page(struct device *dev, struct page *page)

static inline dma_addr_t plat_map_dma_mem_page(struct device *dev,

	struct page *page)

{

	return page_to_phys(page);

}

static unsigned long plat_dma_addr_to_phys(dma_addr_t dma_addr)

static inline unsigned long plat_dma_addr_to_phys(dma_addr_t dma_addr)

{

	return dma_addr;

}

static void plat_unmap_dma_mem(dma_addr_t dma_addr)

static inline void plat_unmap_dma_mem(dma_addr_t dma_addr)

{

}