clk: sunxi-ng: Staticize ccu_mux_helper_unapply_prediv()

It isn't used outside of this file right now.

Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>

drivers/clk/sunxi-ng/ccu_mux.c

@@ -68,7 +68,7 @@ unsigned long ccu_mux_helper_apply_prediv(struct ccu_common *common,
 	return parent_rate / ccu_mux_get_prediv(common, cm, parent_index);
 }
 
-unsigned long ccu_mux_helper_unapply_prediv(struct ccu_common *common,
+static unsigned long ccu_mux_helper_unapply_prediv(struct ccu_common *common,
 					    struct ccu_mux_internal *cm,
 					    int parent_index,
 					    unsigned long parent_rate)