ASoC: tas2781: Add a debugfs node for acoustic tuning

"Acoustic Tuning" debugfs node is a bridge to the acoustic tuning tool
which can tune the chips' acoustic effect.

Signed-off-by: Shenghao Ding <shenghao-ding@ti.com>
Link: https://patch.msgid.link/20250507094616.210-1-shenghao-ding@ti.com


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