ALSA: hda: Add speaker pin to automute Acer Aspire 8943G

ALSA: hda: Add speaker pin to automute Acer Aspire 8943G

commit 2df03514de41f3bbb5623f2e7f2bf594e49cb2ec upstream.

BugLink: https://bugs.launchpad.net/bugs/656625
Add clause for handling Acer Aspire 8943G's subwoofer as additional
speaker pin for automuting.

Reported-by: RussianNeuroMancer
Signed-off-by: Daniel T Chen <crimsun@ubuntu.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>