Complete the AK5365 support. This adds a boolean control to toggle the soft mute feature of the AK5365 chip. Signed-off-by: Jochen Voss <voss@seehuhn.de> Signed-off-by: Takashi Iwai <tiwai@suse.de> Signed-off-by: Jaroslav Kysela <perex@suse.cz>