ASoC: SOF: 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/20191210145406.21419-17-tiwai@suse.deSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/sof/pcm.c

@@ -766,7 +766,6 @@ void snd_sof_new_platform_drv(struct snd_sof_dev *sdev)
 	pd->remove = sof_pcm_remove;
 	pd->open = sof_pcm_open;
 	pd->close = sof_pcm_close;
-	pd->ioctl = snd_soc_pcm_lib_ioctl;
 	pd->hw_params = sof_pcm_hw_params;
 	pd->prepare = sof_pcm_prepare;
 	pd->hw_free = sof_pcm_hw_free;