ALSA: hda/realtek - No loopback on ALC225/ALC295 codec

ALC225/ALC295 also have no loopback mixer.
Signed-off-by: Kailang Yang <kailang@realtek.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/hda/patch_realtek.c

@@ -6805,6 +6805,7 @@ static int patch_alc269(struct hda_codec *codec)
 	case 0x10ec0225:
 	case 0x10ec0295:
 		spec->codec_variant = ALC269_TYPE_ALC225;
+		spec->gen.mixer_nid = 0; /* no loopback on ALC225 ALC295 */
 		break;
 	case 0x10ec0299:
 		spec->codec_variant = ALC269_TYPE_ALC225;