sound: virtuoso: add Xonar DS support

Add experimental support for the Asus Xonar DS.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>
diff --git a/sound/pci/oxygen/Makefile b/sound/pci/oxygen/Makefile
index 389941c..acd8f15 100644
--- a/sound/pci/oxygen/Makefile
+++ b/sound/pci/oxygen/Makefile
@@ -2,7 +2,7 @@
 snd-hifier-objs := hifier.o
 snd-oxygen-objs := oxygen.o
 snd-virtuoso-objs := virtuoso.o xonar_lib.o \
-	xonar_pcm179x.o xonar_cs43xx.o xonar_hdmi.o
+	xonar_pcm179x.o xonar_cs43xx.o xonar_wm87x6.o xonar_hdmi.o
 
 obj-$(CONFIG_SND_OXYGEN_LIB) += snd-oxygen-lib.o
 obj-$(CONFIG_SND_HIFIER) += snd-hifier.o