[MTD] Make init_redwood_flash function static

The function init_redwood_flash is needlessly defined global,
make it static by this patch.
Signed-off-by: Dmitri Vorobiev <dmitri.vorobiev@movial.fi>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>

drivers/mtd/maps/redwood.c

@@ -122,7 +122,7 @@ struct map_info redwood_flash_map = {
 
 static struct mtd_info *redwood_mtd;
 
-int __init init_redwood_flash(void)
+static int __init init_redwood_flash(void)
 {
 	int err;