ASoC: SOF: Intel: Use DMI oem string search for tgl_max98373_rt5682

ASoC: SOF: Intel: Use DMI oem string search for tgl_max98373_rt5682

DMI product name is used to support system variants based out of
tgl_max98373_rt5682 in current implementation. Replace this DMI search with
DMI_OEM_STRING. Coreboot(BIOS used in these systems) is
setting the needed DMI_OEM_STRING field to uniquely identify these
systems.

Signed-off-by: Sathyanarayana Nujella <sathyanarayana.nujella@intel.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Signed-off-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Link: https://lore.kernel.org/r/20200910162705.2026036-1-kai.vehmanen@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>