Use fully qualified class name for DecoderRenderTest in TEST_MAPPING

Change-Id: If98f9722f5a4244d5414bdeda6c16315b436b48b
diff --git a/media/TEST_MAPPING b/media/TEST_MAPPING
index d388596..fd46b5b 100644
--- a/media/TEST_MAPPING
+++ b/media/TEST_MAPPING
@@ -48,7 +48,7 @@
     // Postsubmit tests for TV devices
     "tv-postsubmit": [
        {
-           "name": "DecoderRenderTest"
+           "name": "android.media.decoder.cts.DecoderRenderTest"
        }
     ]
 }