ASoC: Intel: Boards: tgl_max98373: Add BT offload support

BT audio offload is internally configured with virtual GPIOs,
the port assignment is fixed on SSP2 for TGL/ADL platforms.

Reviewed-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Signed-off-by: Yong Zhi <yong.zhi@intel.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20210505163705.305616-2-pierre-louis.bossart@linux.intel.com


Signed-off-by: Mark Brown <broonie@kernel.org>