ASoC: kirkwood: 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/20191210145406.21419-9-tiwai@suse.deSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/kirkwood/kirkwood-dma.c

@@ -316,7 +316,6 @@ const struct snd_soc_component_driver kirkwood_soc_component = {
 	.name		= DRV_NAME,
 	.open		= kirkwood_dma_open,
 	.close		= kirkwood_dma_close,
-	.ioctl		= snd_soc_pcm_lib_ioctl,
 	.hw_params	= kirkwood_dma_hw_params,
 	.hw_free	= kirkwood_dma_hw_free,
 	.prepare	= kirkwood_dma_prepare,