ALSA: hda - Rework on STAC/IDT auto-configuration code

The current auto-configuration code has several problems especially
for the new IDT codecs, e.g. wrong assignment of pins and DACs or
coupled volume for speaker and headphone.

This patch is a fairly large rewrite of the auto-configuration code.
Some remaks

- mic_switch and line_switch contain NIDs instead of bool
- dac_list isn't fixed for IDT 92HD* codecs now, they are all probed
- extra HP and speakers are stored in extra_dacs[].

Signed-off-by: Takashi Iwai <tiwai@suse.de>