commit 6c29d68a upstream.

This quirk is needed for the headset mic to work on this Dell
machine.

BugLink: https://bugs.launchpad.net/bugs/1195597Signed-off-by: David Henningsson <david.henningsson@canonical.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>