ia64: Add export.h to arch/ia64 specific files as required

Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
diff --git a/arch/ia64/xen/hypervisor.c b/arch/ia64/xen/hypervisor.c
index cac4d97..52172ee 100644
--- a/arch/ia64/xen/hypervisor.c
+++ b/arch/ia64/xen/hypervisor.c
@@ -21,6 +21,7 @@
  */
 
 #include <linux/efi.h>
+#include <linux/export.h>
 #include <asm/xen/hypervisor.h>
 #include <asm/xen/privop.h>