ALSA: HDA: patch_analog: Fix SPDIF output on AD1989B

The SPDIF pins for AD1989 are not enabled by default. Set OUT bit so that they
actually work. Also initialize the HDMI SPDIF at the same time.

Signed-off-by: Robin H. Johnson <robbat2@gentoo.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>