ALSA: hda - Clean up ALC299 init code

ALC299 is compatible with ALC225/295, thus it doesn't have to assign
its own model.  Merge together with ALC225/295 code.
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/hda/patch_realtek.c

@@ -6923,12 +6923,9 @@ static int patch_alc269(struct hda_codec *codec)
 		break;
 	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;
-		spec->gen.mixer_nid = 0; /* no loopback on ALC299 */
+		spec->gen.mixer_nid = 0; /* no loopback on ALC225, ALC295 and ALC299 */
 		break;
 	case 0x10ec0234:
 	case 0x10ec0274: