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/kernel/topology.c b/arch/ia64/kernel/topology.c
index 0e0e0cc..9be1f11 100644
--- a/arch/ia64/kernel/topology.c
+++ b/arch/ia64/kernel/topology.c
@@ -22,6 +22,7 @@
 #include <linux/bootmem.h>
 #include <linux/nodemask.h>
 #include <linux/notifier.h>
+#include <linux/export.h>
 #include <asm/mmzone.h>
 #include <asm/numa.h>
 #include <asm/cpu.h>