ALSA: hda - Fix IDT92HD83* codec setup

Remove unnecessary (and buggy) init sequences left for IDT92HD83*
codecs in the previous fixes.  The DACs are now dynamically connected,
thus shouldn't be set statically in init verbs.  Also, the mono_nid
is detected dynamically, thus shouldn't be set staticaly, too.

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