ALSA: hda - Add ALC670 codec support

- Fixed alc_subsystem_id( ) typo and add new function.
   - !(ass & 0x100000)) ==> Delete this check. It is unnecessary check.
   - Add porti
- ALC670 support

Signed-off-by: Kailang Yang <kailang@realtek.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>