mips: remove dma64_addr_t usage

dma64_addr_t looks pointless (at least there is no point that an
architecture has the own dma64_addr_t typedef).

dma_addr_t is set to 32 or 64 bits appropriately.  You can use u64 at
places where you know that 64 bit address is always necessary.

Let's use u64 instead for mips.
Signed-off-by: NFUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Cc: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

arch/mips/include/asm/pci/bridge.h

@@ -839,7 +839,7 @@ struct bridge_controller {
 	nasid_t			nasid;
 	unsigned int		widget_id;
 	unsigned int 		irq_cpu;
-	dma64_addr_t		baddr;
+	u64			baddr;
 	unsigned int		pci_int[8];
 };