ASoC: fsl_micfil: drop unused variables

struct fsl_micfil has unused fields, remove them.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Acked-by: Shengjiu Wang <shengjiu.wang@gmail.com>
Link: https://lore.kernel.org/r/20220414162249.3934543-9-s.hauer@pengutronix.de


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