Export pci_iomap

mwifiex_pcie.ko needs this symbol.

Change-Id: If9847cfb2199b28cf59d993ae330a6cc0a006144
diff --git a/arch/arc/mm/iomap.c b/arch/arc/mm/iomap.c
index 028a960..a9a4eee 100644
--- a/arch/arc/mm/iomap.c
+++ b/arch/arc/mm/iomap.c
@@ -48,6 +48,7 @@
 
     return NULL;
 }
+EXPORT_SYMBOL(pci_iomap);
 
 void pci_iounmap(struct pci_dev *dev, void __iomem * addr)
 {