[ARM] export copy_page

Martin Michlmayr reported that fuse complains:
  ERROR: "copy_page" [fs/fuse/fuse.ko] undefined!

so export the needed function.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/arch/arm/kernel/armksyms.c b/arch/arm/kernel/armksyms.c
index f73d62e..688b7b1 100644
--- a/arch/arm/kernel/armksyms.c
+++ b/arch/arm/kernel/armksyms.c
@@ -179,3 +179,5 @@
 EXPORT_SYMBOL(_find_first_bit_be);
 EXPORT_SYMBOL(_find_next_bit_be);
 #endif
+
+EXPORT_SYMBOL(copy_page);