ALSA: hda - Fix missing capture mixer for ALC861/660 codecs

The capture-related mixer elements are missing with ALC861/ALC660 codecs
when quirks are present, due to missing call of set_capture_mixer().

Reference: Novell bnc#567340
	http://bugzilla.novell.com/show_bug.cgi?id=567340

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Cc: <stable@kernel.org>