ASoC: Intel: maxim-common: add max_98373_get_tx_mask function

Add a helper function max_98373_get_tx_mask() to get tx mask from
max98373 ACPI device properties at runtime.

Reviewed-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Signed-off-by: Brent Lu <brent.lu@intel.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://patch.msgid.link/20240624121119.91552-3-pierre-louis.bossart@linux.intel.com


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