Add test config to libcutils_test

This change allows TradeFederation to run the test directly.
Refer to b/35882476 for design and discussion of this change.

Bug: 35882476
Test: local test
tradefed.sh run template/local --template:map test=libcutils_test

Change-Id: Ie083d1641e4ea226cbf7b82c6fd2c115e15b6bf6
diff --git a/libcutils/tests/Android.bp b/libcutils/tests/Android.bp
index c663a5d..a0b1d7b 100644
--- a/libcutils/tests/Android.bp
+++ b/libcutils/tests/Android.bp
@@ -62,6 +62,7 @@
 
 cc_test {
     name: "libcutils_test",
+    test_suites: ["device-tests"],
     defaults: ["libcutils_test_default"],
     host_supported: true,
     shared_libs: test_libraries,