ALSA: hda/realtek: Enable 4-speaker output for Dell Precision 5560 laptop

The Dell Precision 5560 laptop appears to use the 4-speakers-on-ALC289
audio just like its sibling product XPS 9510, so it requires the same
quirk to enable woofer output. Tested on my Dell Precision 5560.

Signed-off-by: John Liu <johnliu55tw@gmail.com>
Cc: <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20210930115316.659-1-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>