clk: mux: assign init data

The original conversion to struct clk_hw_init failed to add the pointer
assignment in clk_register_mux.

Signed-off-by: Mike Turquette <mturquette@linaro.org>
Reported-by: Sascha Hauer <s.hauer@pengutronix.de>

drivers/clk/clk-mux.c

@@ -116,6 +116,7 @@ struct clk *clk_register_mux(struct device *dev, const char *name,
 	mux->width = width;
 	mux->flags = clk_mux_flags;
 	mux->lock = lock;
+	mux->hw.init = &init;
 
 	clk = clk_register(dev, &mux->hw);