rt722: change output volume of speaker to 0dB

alsa-project/alsa-ucm-conf pull request #506 was opened from shumingfan:

This patch also changes hardware gain to software gain when using volume bar.

Request URL : https://github.com/alsa-project/alsa-ucm-conf/pull/506 Patch URL : https://github.com/alsa-project/alsa-ucm-conf/pull/506.patch Repository URL: https://github.com/alsa-project/alsa-ucm-conf