Added the support for Dell T3400 with AD1984 codec chip.
ALSA bug#3699:
	https://bugtrack.alsa-project.org/alsa-bug/view.php?id=3699Signed-off-by: Douglas Kosovic <douglask@itee.uq.edu.au>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>