Disable aidl tag tracing in libbinder_aidl_test_stub

This is blocking presubmit and it's unclear why. Given it's
a test target, should be fine to disable aidl tag tracing anyways

Test: m
Bug: 161393989
Change-Id: I9ad382aaa9ddd5f3974ccf0ca352bdff7ca3bc7a
diff --git a/libs/binder/Android.bp b/libs/binder/Android.bp
index 5dca468..f5f9c49 100644
--- a/libs/binder/Android.bp
+++ b/libs/binder/Android.bp
@@ -485,6 +485,9 @@
         java: {
             enabled: false,
         },
+        cpp: {
+            gen_trace: false,
+        },
     },
 }