ALSA: hda - Add missing Line-Out and PCM switches as slave

Realtek codecs may have "PCM" and "Line-Out" playback switches, and
they can be slaves for vmaster.

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

sound/pci/hda/patch_realtek.c

@@ -2401,6 +2401,8 @@ static const char *alc_slave_sws[] = {
 	"Speaker Playback Switch",
 	"Mono Playback Switch",
 	"IEC958 Playback Switch",
+	"Line-Out Playback Switch",
+	"PCM Playback Switch",
 	NULL,
 };