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 --git a/sound/pci/Kconfig b/sound/pci/Kconfig
index 5add96b..7b2678a 100644
--- a/sound/pci/Kconfig
+++ b/sound/pci/Kconfig
@@ -817,7 +817,7 @@
 	  Say Y here to include support for sound cards based on the
 	  Asus AV66/AV100/AV200 chips, i.e., Xonar D1, DX, D2, D2X, DS,
 	  Essence ST (Deluxe), and Essence STX.
-	  Support for the HDAV1.3 (Deluxe) is incomplete; for the
+	  Support for the HDAV1.3 (Deluxe) is experimental; for the
 	  HDAV1.3 Slim and Xense, missing.
 
 	  To compile this driver as a module, choose M here: the module