ASoC: Intel: sof_rt5682: Add support for Rex with discrete BT offload.

ASoC: Intel: sof_rt5682: Add support for Rex with discrete BT offload.

System firmware has included additional audio DMI string
MAX98360_ALC5682I_DISCRETE_I2S_BT for discrete BT offload
supporting devices. Same DMI string match is introduced
in sof_rt5682_quirk_table.

Signed-off-by: Uday M Bhat <uday.m.bhat@intel.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Link: https://lore.kernel.org/r/20230915124852.1696857-9-yung-chuan.liao@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>