ALSA: hda/via: Add minimum mute flag

It turned out that VIA codecs also mute the sound in the lowest mixer
level.  Turn on the dac_min_mute flag to indicate the mute-as-minimum
in TLV like already done in Conexant and IDT codecs.

BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=210559
Cc: <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20210114072453.11379-1-tiwai@suse.deSigned-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/hda/patch_via.c

@@ -113,6 +113,7 @@ static struct via_spec *via_new_spec(struct hda_codec *codec)
 		spec->codec_type = VT1708S;
 	spec->gen.indep_hp = 1;
 	spec->gen.keep_eapd_on = 1;
+	spec->gen.dac_min_mute = 1;
 	spec->gen.pcm_playback_hook = via_playback_pcm_hook;
 	spec->gen.add_stereo_mix_input = HDA_HINT_STEREO_MIX_AUTO;
 	codec->power_save_node = 1;