ALSA: hda: Fix the wrong register was used for DVC of TAS2770

The wrong register was used for digital volume control of TAS2770,
The definition was changed, and usage was also updated.

Fixes: ab29b346 ("ALSA: hda: Add TAS2770 support")
Signed-off-by: Baojun Xu <baojun.xu@ti.com>
Link: https://patch.msgid.link/20250729145849.55057-1-baojun.xu@ti.com


Signed-off-by: Takashi Iwai <tiwai@suse.de>