[ALSA] hda-codec - remove duplicate controls in alc268 test mixer

I've just noticed that there are a handful of duplicate controls in the
ALC268 test model mixer.  This patch (against alsa-driver 1.0.16) removes
them.
Signed-off-by: Jonathan Woithe <jwoithe@physics.adelaide.edu.au>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/hda/patch_realtek.c

@@ -9840,11 +9840,6 @@ static struct hda_input_mux alc268_capture_source = {
 
 #ifdef CONFIG_SND_DEBUG
 static struct snd_kcontrol_new alc268_test_mixer[] = {
-	HDA_CODEC_VOLUME("Front Playback Volume", 0x2, 0x0, HDA_OUTPUT),
-	HDA_CODEC_MUTE("Front Playback Switch", 0x14, 0x0, HDA_OUTPUT),
-	HDA_CODEC_VOLUME("Headphone Playback Volume", 0x3, 0x0, HDA_OUTPUT),
-	HDA_CODEC_MUTE("Headphone Playback Switch", 0x15, 0x0, HDA_OUTPUT),
-
 	/* Volume widgets */
 	HDA_CODEC_VOLUME("LOUT1 Playback Volume", 0x02, 0x0, HDA_OUTPUT),
 	HDA_CODEC_VOLUME("LOUT2 Playback Volume", 0x03, 0x0, HDA_OUTPUT),