ASoC: Update AD1938 for new TDM slot API

It's only actually paying attention to the slot count anyway.
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

sound/soc/codecs/ad1938.c

@@ -133,8 +133,8 @@ static inline int ad1938_pll_powerctrl(struct snd_soc_codec *codec, int cmd)
 	return 0;
 }
 
-static int ad1938_set_tdm_slot(struct snd_soc_dai *dai,
-		unsigned int mask, int slots)
+static int ad1938_set_tdm_slot(struct snd_soc_dai *dai, unsigned int tx_mask,
+			       unsigned int mask, int slots, int width)
 {
 	struct snd_soc_codec *codec = dai->codec;
 	int dac_reg = codec->read(codec, AD1938_DAC_CTRL1);