Moved libalsautils to vendor. Marked libaudioutils and libaudioroute as
vendor_available

Bug: 33241851
Bug: 37527576
Test: Build sailfish and pass CTS audio
Test: With BOARD_VNDK_VERSION:=current, no link type check
errors related to these libs

Change-Id: Ifacd2305a79a50f6bf3182344bc678082047022f
diff --git a/audio_route/Android.bp b/audio_route/Android.bp
index a3f19e4..6534e46 100644
--- a/audio_route/Android.bp
+++ b/audio_route/Android.bp
@@ -1,5 +1,6 @@
 cc_library_shared {
     name: "libaudioroute",
+    vendor_available: true,
     srcs: ["audio_route.c"],
     shared_libs: [
         "liblog",