ASoC: utils: Drop superfluous ioctl PCM ops

ASoC PCM core deals the empty ioctl field now as default.
Let's kill the redundant lines.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Link: https://lore.kernel.org/r/20191210145406.21419-23-tiwai@suse.deSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/soc-utils.c

@@ -77,7 +77,6 @@ static int dummy_dma_open(struct snd_soc_component *component,
 
 static const struct snd_soc_component_driver dummy_platform = {
 	.open		= dummy_dma_open,
-	.ioctl		= snd_soc_pcm_lib_ioctl,
 };
 
 static const struct snd_soc_component_driver dummy_codec = {