BugLink: https://bugs.launchpad.net/bugs/418627

The original reporter states that this quirk is necessary to obtain
reasonable gain for playback.  Without it, sound is inaudible.  Tested
with playback (spkr and hp) and capture.
Signed-off-by: Daniel T Chen <crimsun@ubuntu.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>