Make libaudioeffects vendor available.

This means that both system and vendor libraries
can link against it when the vndk is enabled (when
BOARD_VNDK_VERSION=current is set.

Test: build libaudioeffects with BOARD_VNDK_VERSION=current
Bug: 37342627
Change-Id: I1aa26abd1486e5b432617cb37eaf69e777e7ca6f
diff --git a/audio_effects/Android.bp b/audio_effects/Android.bp
index e4e44b7..78d2abe 100644
--- a/audio_effects/Android.bp
+++ b/audio_effects/Android.bp
@@ -1,5 +1,6 @@
 cc_library_headers {
     name: "libaudioeffects",
+    vendor_available: true,
     header_libs: ["libhardware_headers"],
     export_header_lib_headers: ["libhardware_headers"],
     export_include_dirs: ["include"],