ALSA: HDA: Fixup unnecessary volume control index on Realtek ALC88x

commit 7e59e097 upstream.

Without this change, a volume control named "Surround" or "Side" would
get an unnecessary index, causing it to be ignored by the vmaster and
PulseAudio.

Tested-by: Bartłomiej Żogała <nusch88@gmail.com>
Signed-off-by: David Henningsson <david.henningsson@canonical.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>