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>
diff --git a/sound/pci/hda/patch_realtek.c b/sound/pci/hda/patch_realtek.c
index d0d14ed..0fbcbee 100644
--- a/sound/pci/hda/patch_realtek.c
+++ b/sound/pci/hda/patch_realtek.c
@@ -2401,6 +2401,8 @@
 	"Speaker Playback Switch",
 	"Mono Playback Switch",
 	"IEC958 Playback Switch",
+	"Line-Out Playback Switch",
+	"PCM Playback Switch",
 	NULL,
 };