[ALSA] hda: stac9202 mixer fix

Added support for line out controls for STAC9202 cards, and fixed issue
where master mixer control was being created twice for headphone and
speaker outs.

Signed-off-by: Matthew Ranostay <mranostay@embeddedalley.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>