microblaze: remove unused HAVE_ARCH_PCI_SET_DMA_MASK

HAVE_ARCH_PCI_SET_DMA_MASK was removed in 2.6.34 (no architecture has
the own implementation of pci_set_dma_mask).
Signed-off-by: NFUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: NMichal Simek <monstr@monstr.eu>

arch/microblaze/include/asm/dma-mapping.h

@@ -79,12 +79,6 @@ static inline int dma_supported(struct device *dev, u64 mask)
 	return ops->dma_supported(dev, mask);
 }
 
-#ifdef CONFIG_PCI
-/* We have our own implementation of pci_set_dma_mask() */
-#define HAVE_ARCH_PCI_SET_DMA_MASK
-
-#endif
-
 static inline int dma_set_mask(struct device *dev, u64 dma_mask)
 {
 	struct dma_map_ops *ops = get_dma_ops(dev);