[ALSA] hda-codec - Add 5 stack audio support for Intel 965 systems

This patch renames the 965_2112 function ids to 965_3ST, and
adds functional support for 965_5ST (5 stack 7.1 surround).

Signed-off-by: Tobin Davis <tdavis@dsl-only.net>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>