ASoC: SOF: imx8m: Fix SAI DAI driver for i.MX8M

ASoC: SOF: imx8m: Fix SAI DAI driver for i.MX8M

This must match DAI name from topology. Also, sai-port
is too generic. Physical DAI port on i.MX8MP is labeled SAI3.

Signed-off-by: Daniel Baluta <daniel.baluta@nxp.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Reviewed-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Reviewed-by: Guennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com>
Link: https://lore.kernel.org/r/20200720072046.8152-5-daniel.baluta@oss.nxp.com
Signed-off-by: Mark Brown <broonie@kernel.org>