[ALSA] hda: STAC927x invalid association value

STAC_DELL_BIOS quirks were setting the association value wrong
for port 0x0f, which prevented it from being included in hp_outs[].

Signed-off-by: Matthew Ranostay <mranostay@embeddedalley.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>