ALSA: hda - Add quirk for Gateway T6834c laptop

ALSA: hda - Add quirk for Gateway T6834c laptop

commit 42b95f0c6b524b5a670dd17533a3522db368f600 upstream.

Gateway T6834c laptops need EAPD always on while the default behavior
for the STAC9205 reference board is to turn it off upon every HP plug.
By using the special "eapd" model, which is first introduced for Gateway
T1616 laptops for this same reason, this peculiarity can be properly
handled.

Signed-off-by: Hao Song <baritono.tux@gmail.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>