Make Vorbis decoding through stagefright the default.

Change-Id: I4273b766024f5363fdd05c3d30d0c71209679950
diff --git a/target/product/core.mk b/target/product/core.mk
index 97f4b8d..351033a 100644
--- a/target/product/core.mk
+++ b/target/product/core.mk
@@ -48,4 +48,5 @@
     media.stagefright.enable-player=true \
     media.stagefright.enable-meta=true   \
     media.stagefright.enable-scan=true   \
-    media.stagefright.enable-http=true
+    media.stagefright.enable-http=true   \
+    media.stagefright.enable-vorbis=true