ASoC: ak4642: Remove CLK_IS_ROOT

This flag is a no-op now (see commit 47b0eeb3 "clk: Deprecate
CLK_IS_ROOT", 2016-02-02) so remove it.
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Acked-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/ak4642.c

@@ -608,9 +608,7 @@ static struct clk *ak4642_of_parse_mcko(struct device *dev)
 
 	of_property_read_string(np, "clock-output-names", &clk_name);
 
-	clk = clk_register_fixed_rate(dev, clk_name, parent_clk_name,
-				      (parent_clk_name) ? 0 : CLK_IS_ROOT,
-				      rate);
+	clk = clk_register_fixed_rate(dev, clk_name, parent_clk_name, 0, rate);
 	if (!IS_ERR(clk))
 		of_clk_add_provider(np, of_clk_src_simple_get, clk);