ASoC: bcm: Drop superfluous ioctl PCM ops

ASoC PCM core deals the empty ioctl field now as default.
Let's kill the redundant lines.

Cc: Ray Jui <rjui@broadcom.com>
Cc: Scott Branden <sbranden@broadcom.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Link: https://lore.kernel.org/r/20191210145406.21419-5-tiwai@suse.deSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/bcm/cygnus-pcm.c

@@ -818,7 +818,6 @@ static int cygnus_dma_new(struct snd_soc_component *component,
 static struct snd_soc_component_driver cygnus_soc_platform = {
 	.open		= cygnus_pcm_open,
 	.close		= cygnus_pcm_close,
-	.ioctl		= snd_soc_pcm_lib_ioctl,
 	.hw_params	= cygnus_pcm_hw_params,
 	.hw_free	= cygnus_pcm_hw_free,
 	.prepare	= cygnus_pcm_prepare,