Add metadata to modules in system/tools/hidl

Add metadata. key="plan"; value="vts-library".

Test: vts-tradefed run commandAndExit vts-library --include-filter VtsHidlUnitTests
Bug: 70485967
Change-Id: Ifead85e53ca324be6f466727e57ff7907fc24b1c
diff --git a/test/hidl_test/AndroidTest.xml b/test/hidl_test/AndroidTest.xml
index f6a871d..1490078 100644
--- a/test/hidl_test/AndroidTest.xml
+++ b/test/hidl_test/AndroidTest.xml
@@ -14,6 +14,7 @@
      limitations under the License.
 -->
 <configuration description="Config for VTS HIDL unit tests">
+    <option name="config-descriptor:metadata" key="plan" value="vts-library" />
     <target_preparer class="com.android.compatibility.common.tradefed.targetprep.VtsFilePusher">
         <option name="push-group" value="HostDrivenTest.push" />
         <option name="cleanup" value="true" />