ASoC: sprd: Drop superfluous ioctl PCM ops

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

Cc: Orson Zhai <orsonzhai@gmail.com>
Cc: Baolin Wang <baolin.wang7@gmail.com>
Cc: Chunyan Zhang <zhang.lyra@gmail.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Reviewed-by: Baolin Wang <baolin.wang7@gmail.com>
Link: https://lore.kernel.org/r/20191210145406.21419-18-tiwai@suse.de


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