Forward the ResultReceiver to Tethering Entitlement app

Bug: 156336264
Test: atest TetherProvisioningActivityTest
Change-Id: I37fcaddd5569223146ff9d6316d97f33312d8d24
diff --git a/tests/unit/Android.bp b/tests/unit/Android.bp
index 43bf02c..583b46e 100644
--- a/tests/unit/Android.bp
+++ b/tests/unit/Android.bp
@@ -12,6 +12,7 @@
     ],
 
     static_libs: [
+        "androidx.test.core",
         "androidx.test.rules",
         "androidx.test.espresso.core",
         "androidx.test.espresso.contrib-nodeps",