Make libRS.so buildable for native bridge

Bug: http://b/153609531

Test: m libRS.native_bridge

Change-Id: I9dc5c921fde25a67efee8941041904e8fa37386f
diff --git a/cpp/Android.bp b/cpp/Android.bp
index 973c563..1d08b02 100644
--- a/cpp/Android.bp
+++ b/cpp/Android.bp
@@ -1,5 +1,6 @@
 cc_library_static {
     name: "libRSDispatch",
+    native_bridge_supported: true,
     vendor_available: true,
 
     srcs: ["rsDispatch.cpp"],