Make crash_dump.policy a dependency of crash_dump.

debuggerd_test depends on it, and the easiest way to
ensure that the file is available when running the tests
is to make it a dependency of crash_dump.

Change-Id: Iebea8e0c49d8d49d52a434e4194e870793758988
diff --git a/debuggerd/Android.bp b/debuggerd/Android.bp
index edcea44..a541f6e 100644
--- a/debuggerd/Android.bp
+++ b/debuggerd/Android.bp
@@ -391,6 +391,9 @@
     apex_available: [
         "com.android.runtime",
     ],
+
+    // Required for tests.
+    required: ["crash_dump.policy"],
 }
 
 cc_binary {