Allow AIBinder<->IBinder when sharing libbinder.

Fixes: 159372351
Test: libbinder_ndk_unit_test
Change-Id: I4051e32e487e92ee70f85a733877cd709fc510eb
diff --git a/libs/binder/ndk/tests/IBinderNdkUnitTest.aidl b/libs/binder/ndk/tests/IBinderNdkUnitTest.aidl
index 4bba9e4..dc77467d 100644
--- a/libs/binder/ndk/tests/IBinderNdkUnitTest.aidl
+++ b/libs/binder/ndk/tests/IBinderNdkUnitTest.aidl
@@ -22,6 +22,8 @@
 import IEmpty;
 
 interface IBinderNdkUnitTest {
+    int repeatInt(int a);
+
     void takeInterface(IEmpty test);
     void forceFlushCommands();