ASoC: fsl_micfil: Use SET_SYSTEM_SLEEP_PM_OPS to simplify PM

Use SET_SYSTEM_SLEEP_PM_OPS to simplify suspend and resume function.
fsl_micfil_suspend() and fsl_micfil_resume() can be deleted.

Signed-off-by: Chancel Liu <chancel.liu@nxp.com>
Acked-by: Shengjiu Wang <shengjiu.wang@gmail.com>
Link: https://lore.kernel.org/r/20230802052117.1293029-4-chancel.liu@nxp.com


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