mn10300: kernel/traps.c needs <linux/export.h>

Fix the warning:

  arch/mn10300/kernel/traps.c:304:1: warning: data definition has no type or storage class [enabled by default]
  arch/mn10300/kernel/traps.c:304:1: warning: type defaults to 'int' in declaration of 'EXPORT_SYMBOL' [-Wimplicit-int]
  arch/mn10300/kernel/traps.c:304:1: warning: parameter names (without types) in function declaration [enabled by default]
Signed-off-by: NGeert Uytterhoeven <geert@linux-m68k.org>
Cc: David Howells <dhowells@redhat.com>
Cc: Koichi Yasutake <yasutake.koichi@jp.panasonic.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

arch/mn10300/kernel/traps.c

@@ -26,6 +26,7 @@
 #include <linux/kdebug.h>
 #include <linux/bug.h>
 #include <linux/irq.h>
+#include <linux/export.h>
 #include <asm/processor.h>
 #include <linux/uaccess.h>
 #include <asm/io.h>