microblaze: Do not use module.h in files which are not modules

Based on the patch:
"lib: reduce the use of module.h wherever possible"
(sha1: 8bc3bcc93a2b4e47d5d410146f6546bca6171663)
fix all microblaze files which are not modules.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
diff --git a/arch/microblaze/lib/ashldi3.c b/arch/microblaze/lib/ashldi3.c
index dd80fbc..1af904c 100644
--- a/arch/microblaze/lib/ashldi3.c
+++ b/arch/microblaze/lib/ashldi3.c
@@ -1,4 +1,4 @@
-#include <linux/module.h>
+#include <linux/export.h>
 
 #include "libgcc.h"