ASoC: Drop exporting ad1980_dai

ad1980_dai is not used outside this driver,
thus drop exporting it.
Signed-off-by: Axel Lin <axel.lin@gmail.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

sound/soc/codecs/ad1980.c

@@ -148,7 +148,6 @@ static struct snd_soc_dai_driver ad1980_dai = {
 		.rates = SNDRV_PCM_RATE_48000,
 		.formats = SND_SOC_STD_AC97_FMTS, },
 };
-EXPORT_SYMBOL_GPL(ad1980_dai);
 
 static int ad1980_reset(struct snd_soc_codec *codec, int try_warm)
 {