ALSA: HDA: Use LPIB position fix for Oaktrail

According to the thread on alsa-devel, the LPIB method is to prefer
for Oaktrail controller chip.

Reference: http://mailman.alsa-project.org/pipermail/alsa-devel/2012-January/047800.html



Signed-off-by: David Henningsson <david.henningsson@canonical.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>