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

Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
diff --git a/arch/sh/kernel/topology.c b/arch/sh/kernel/topology.c
index 38e8628..ab37955 100644
--- a/arch/sh/kernel/topology.c
+++ b/arch/sh/kernel/topology.c
@@ -13,6 +13,7 @@
 #include <linux/percpu.h>
 #include <linux/node.h>
 #include <linux/nodemask.h>
+#include <linux/export.h>
 
 static DEFINE_PER_CPU(struct cpu, cpu_devices);