ASoC: Fix forgotten replacements of socdev->codec

The snd_soc_codec was moved into socdev->card, but this change wasn't
applied in some places.  Fixed now.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/soc/omap/n810.c b/sound/soc/omap/n810.c
index 25593fe..9f037cd 100644
--- a/sound/soc/omap/n810.c
+++ b/sound/soc/omap/n810.c
@@ -72,7 +72,7 @@
 {
 	struct snd_pcm_runtime *runtime = substream->runtime;
 	struct snd_soc_pcm_runtime *rtd = substream->private_data;
-	struct snd_soc_codec *codec = rtd->socdev->codec;
+	struct snd_soc_codec *codec = rtd->socdev->card->codec;
 
 	snd_pcm_hw_constraint_minmax(runtime,
 				     SNDRV_PCM_HW_PARAM_CHANNELS, 2, 2);