[ALSA] hda-codec - Add support for new Intel boards with Stac9227 codec

This patch adds full 5.1 audio support for Intel boards
with the SigmaTel 9227 codec chip (946, 963, 965 series).
 

Signed-off-by: Tobin Davis <tobinx.b.davis@intel.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>