ASoC: SOF: imx8m: Add DAI driver entry for MICFIL PDM

This will allow creating of PDM DAI links.

Reviewed-by: Péter Ujfalusi <peter.ujfalusi@linux.intel.com>
Reviewed-by: Iuliana Prodan <iuliana.prodan@nxp.com>
Signed-off-by: Daniel Baluta <daniel.baluta@nxp.com>
Link: https://lore.kernel.org/r/20231109135900.88310-2-daniel.baluta@oss.nxp.com


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