ALSA: hda - Add a headset quirk for Dell XPS 13

This quirk is needed for the headset microphone to work.

Alsa-info at http://www.alsa-project.org/db/?f=8c7dfe857ceff462ca2de133e67023c0f68de9cb

Cc: stable@vger.kernel.org (3.10+)
Reported-by: Po-Hsu Lin <po-hsu.lin@canonical.com>
Signed-off-by: David Henningsson <david.henningsson@canonical.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>