ASoC: SOF: Intel: Use DMI string to search for adl_mx98373_rt5682 variant

ASoC: SOF: Intel: Use DMI string to search for adl_mx98373_rt5682 variant

DMI product name is used to support system variants based on
adl_mx98373_rt5682 in current implementation. Replace this DMI search with
DMI_OEM_STRING and coreboot(BIOS used in these systems) is
setting the needed DMI_OEM_STRING field to uniquely identify these
systems.

Reviewed-by: Bard Liao <bard.liao@intel.com>
Signed-off-by: jairaj arava <jairaj.arava@intel.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20210802152151.15832-3-pierre-louis.bossart@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>