ASoC: fsl_micfil: Add support when using eDMA

On i.MX93 platform MICFIL uses eDMA. The maxburst should be set to the
number of channels in eDMA multiple FIFO mode.

Signed-off-by: Chancel Liu <chancel.liu@nxp.com>
Acked-by: Shengjiu Wang <shengjiu.wang@gmail.com>
Link: https://lore.kernel.org/r/20221028082750.991822-4-chancel.liu@nxp.com
Signed-off-by: Mark Brown <broonie@kernel.org>