ALSA: hda - Add quirk for Gateway %1616 laptop

Gateway T1616 laptop needs EAPD always on while the current STAC9205
code turns off per HP plug.  Added a new model "eapd" to keep it on.

Reference: Novell bnc#467597
	https://bugzilla.novell.com/show_bug.cgi?id=467597



Signed-off-by: Takashi Iwai <tiwai@suse.de>