support 2 hw boards.
1. SSP2 connects max98390, 2 speakers.
2. SSP1 connects max98390, 2/4 speakers.

2 or 4 speakers playback
add echo reference capture
add bt offload support
add DMI_OEM_STRING for board variants
add ALC5682I-VS support
Signed-off-by: Mark Hsieh <mark_hsieh@wistron.corp-partner.google.com>
Signed-off-by: Mac Chiang <mac.chiang@intel.com>
Signed-off-by: Kieth Tzeng <keith.tzeng@quantatw.com>
Signed-off-by: Brent Lu <brent.lu@intel.com>
Acked-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20211125030453.4382-1-mac.chiang@intel.comSigned-off-by: Mark Brown <broonie@kernel.org>