ALSA: hda - Add quirk for Dell Vostro 1220

model=dell-vostro is needed for Dell Vostro 1220 with Coexnat 5067.

Reference: Novell bnc#631066
	https://bugzilla.novell.com/show_bug.cgi?id=631066



Cc: <stable@kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>