ASoC: Drop snd_soc_pcm_lib_ioctl()

Now all snd_soc_pcm_lib_ioctl() calls were dropped, and it became
superfluous.  Let's kill it.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Link: https://lore.kernel.org/r/20191210145406.21419-24-tiwai@suse.de


Signed-off-by: Mark Brown <broonie@kernel.org>