ALSA: hda - Remove PCM mixer elements from Virtual Master of realtek

Afer commit aa202455 , none of realtek
codec has hardware volume control "PCM Playback Volume" and
"PCM Playback Switch".

As Virtual Master require all slave controls must have same number of step
and dB range.
Signed-off-by: NRaymond Yau <superquad.vortex2@gmail.com>
Signed-off-by: NTakashi Iwai <tiwai@suse.de>

sound/pci/hda/patch_realtek.c

@@ -3155,7 +3155,6 @@ static const char * const alc_slave_vols[] = {
 	"Speaker Playback Volume",
 	"Mono Playback Volume",
 	"Line-Out Playback Volume",
-	"PCM Playback Volume",
 	NULL,
 };
 
@@ -3170,7 +3169,6 @@ static const char * const alc_slave_sws[] = {
 	"Mono Playback Switch",
 	"IEC958 Playback Switch",
 	"Line-Out Playback Switch",
-	"PCM Playback Switch",
 	NULL,
 };