[ALSA] Remove unused variables

AC97 Codec
Removed unused variables (the old control definitions).
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/ac97/ac97_codec.c

@@ -658,11 +658,6 @@ AC97_SINGLE("LFE Playback Switch", AC97_CENTER_LFE_MASTER, 15, 1, 1),
 AC97_SINGLE("LFE Playback Volume", AC97_CENTER_LFE_MASTER, 8, 31, 1)
 };
 
-static const snd_kcontrol_new_t snd_ac97_controls_surround[2] = {
-AC97_DOUBLE("Surround Playback Switch", AC97_SURROUND_MASTER, 15, 7, 1, 1),
-AC97_DOUBLE("Surround Playback Volume", AC97_SURROUND_MASTER, 8, 0, 31, 1),
-};
-
 static const snd_kcontrol_new_t snd_ac97_control_eapd =
 AC97_SINGLE("External Amplifier", AC97_POWERDOWN, 15, 1, 1);