ASoC: Use symmetric rates for WM8974

The chip has a single LRCLK.
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

sound/soc/codecs/wm8974.c

@@ -631,6 +631,7 @@ struct snd_soc_dai wm8974_dai = {
 		.rates = WM8974_RATES,
 		.formats = WM8974_FORMATS,},
 	.ops = &wm8974_ops,
+	.symmetric_rates = 1,
 };
 EXPORT_SYMBOL_GPL(wm8974_dai);