[ALSA] hda: Add GPIO mute support to STAC9205

Support added for detecting HP jack presence via GPIO on several laptop docks.

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