[MIPS] Fix build error on processors that don's support copy-on-write.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/lib/iomap.c

@@ -63,7 +63,7 @@ void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long maxlen)
 		return ioport_map(start, len);
 	if (flags & IORESOURCE_MEM) {
 		if (flags & IORESOURCE_CACHEABLE)
-			return ioremap_cacheable_cow(start, len);
+			return ioremap_cachable(start, len);
 		return ioremap_nocache(start, len);
 	}