PCI: remove pci_dac_dma_... APIs on mn10300

It seems that mn10300 made it upstream after Jan Beulich's pci_dac_dma_*
cleanup work and still defines pci_dac_dma_supported(). This API is not
required by the PCI subsystem anymore, so remove it.
Acked-by: David Howells <dhowells@redhat.com>
Signed-off-by: Fernando Luis Vazquez Cao <fernando@oss.ntt.co.jp>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>

arch/mn10300/include/asm/pci.h

@@ -70,10 +70,6 @@ struct pci_dev;
  */
 #define PCI_DMA_BUS_IS_PHYS	(1)
 
-
-/* This is always fine. */
-#define pci_dac_dma_supported(pci_dev, mask)	(0)
-
 /* Return the index of the PCI controller for device. */
 static inline int pci_controller_num(struct pci_dev *dev)
 {