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/mm/init.c b/arch/sh/mm/init.c
index 58a93fb3..4e5192b 100644
--- a/arch/sh/mm/init.c
+++ b/arch/sh/mm/init.c
@@ -18,6 +18,7 @@
 #include <linux/io.h>
 #include <linux/memblock.h>
 #include <linux/dma-mapping.h>
+#include <linux/export.h>
 #include <asm/mmu_context.h>
 #include <asm/mmzone.h>
 #include <asm/kexec.h>