libalsautils: moved to vendor partition

Generic AOSP system image doesn't need libalsautils, so move
it to vendor partition in case vendors use it.

Bug: 37117855
Test: Build it with "vendor: true," and make sure it's actually
moved to vendor and also boot successfully on Sailfish.
Change-Id: Ib8c08276f0435b2b37ac6179100b7287b08f6f03
diff --git a/alsa_utils/Android.bp b/alsa_utils/Android.bp
index 4746af6..247419f 100644
--- a/alsa_utils/Android.bp
+++ b/alsa_utils/Android.bp
@@ -14,6 +14,7 @@
 
 cc_library_shared {
     name: "libalsautils",
+    vendor: true,
     srcs: [
         "alsa_device_profile.c",
         "alsa_device_proxy.c",