[ALSA] ac97 - Fix MSI L720 laptop

Fix internal speaker output of MSI L720 laptop with ALC655 codec.
Signed-off-by: NTakashi Iwai <tiwai@suse.de>
Signed-off-by: NJaroslav Kysela <perex@suse.cz>

sound/pci/ac97/ac97_patch.c

@@ -2727,6 +2727,7 @@ static int patch_alc655(struct snd_ac97 * ac97)
 		    (ac97->subsystem_device == 0x0131 || /* MSI S270 laptop */
 		     ac97->subsystem_device == 0x0161 || /* LG K1 Express */
 		     ac97->subsystem_device == 0x0351 || /* MSI L725 laptop */
+		     ac97->subsystem_device == 0x0471 || /* MSI L720 laptop */
 		     ac97->subsystem_device == 0x0061))  /* MSI S250 laptop */
 			val &= ~(1 << 1); /* Pin 47 is EAPD (for internal speaker) */
 		else