ALSA: hda: Use LPIB and 6stack-dig for eMachines T5212

ALSA: hda: Use LPIB and 6stack-dig for eMachines T5212

commit 572c0e3c73341755f3e7dfaaef6b26df12bd709c upstream.

BugLink: https://bugs.launchpad.net/bugs/538895
The OR has verified that both position_fix=1 and model=6stack-dig are
necessary to have capture function properly. (The existing 3stack-6ch
model quirk seems to be incorrect.)

Reported-by: Reuben Bailey <reuben.e.bailey@gmail.com>
Tested-by: Reuben Bailey <reuben.e.bailey@gmail.com>
Signed-off-by: Daniel T Chen <crimsun@ubuntu.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>