Interface for hidl forward reference test

Test proofs that forward reference can now be used.
Test contains trie implementation and some forward reference examples.

Bug: 31827278

Test: hidl_test

Change-Id: I55cdde500baea3e70ebf4466c681ad652b6ff9fd
diff --git a/tests/Android.bp b/tests/Android.bp
index 9583bfd..18fc473 100644
--- a/tests/Android.bp
+++ b/tests/Android.bp
@@ -25,4 +25,6 @@
     "pointer/1.0",
     "pointer/1.0/default",
     "pointer/1.0/default/lib",
+    "trie/1.0",
+    "trie/1.0/default",
 ]