ALSA: virtuoso: add HDMI enable switch for HDAV1.3

The GPIO bit that enables analog output on the Xonar HDAV1.3 also
disables the HDMI audio output, so we better add a switch for it.
Hopefully, this is sufficient to make the HDMI output work.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --cc sound/pci/Kconfig
Simple merge

diff --cc sound/pci/oxygen/xonar.h
Simple merge

diff --cc sound/pci/oxygen/xonar_lib.c
Simple merge

diff --cc sound/pci/oxygen/xonar_pcm179x.c
Simple merge