ASoC: Intel: sof_sdw_rt1308: remove codec dai use

Use macro.
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20200409185827.16255-11-pierre-louis.bossart@linux.intel.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/intel/boards/sof_sdw_rt1308.c

@@ -93,7 +93,7 @@ static int rt1308_i2s_hw_params(struct snd_pcm_substream *substream,
 {
 	struct snd_soc_pcm_runtime *rtd = substream->private_data;
 	struct snd_soc_card *card = rtd->card;
-	struct snd_soc_dai *codec_dai = rtd->codec_dai;
+	struct snd_soc_dai *codec_dai = asoc_rtd_to_codec(rtd, 0);
 	int clk_id, clk_freq, pll_out;
 	int err;