Instantiate snd_soc_dai_driver for independent symmetric control.
Otherwise the symmetric setting may be overwritten by other
instance.

Fixes: 08fdf65e ("ASoC: fsl_sai: Add asynchronous mode support")
Signed-off-by: Shengjiu Wang <shengjiu.wang@nxp.com>
Link: https://lore.kernel.org/r/1600424760-32071-1-git-send-email-shengjiu.wang@nxp.comSigned-off-by: Mark Brown <broonie@kernel.org>