ALSA: virtuoso: add Xonar D1 support

Add support for the Asus Xonar D1.  It is the same as the DX, but
without the external power detection.

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 f7d95b2..31f52d3 100644
--- a/sound/pci/Kconfig
+++ b/sound/pci/Kconfig
@@ -845,7 +845,7 @@
 	select SND_OXYGEN_LIB
 	help
 	  Say Y here to include support for sound cards based on the
-	  Asus AV100/AV200 chips, i.e., Xonar D2, DX and D2X.
+	  Asus AV100/AV200 chips, i.e., Xonar D1, DX, D2 and D2X.
 
 	  To compile this driver as a module, choose M here: the module
 	  will be called snd-virtuoso.