Sets minSdkVersion for TTS model.

Bug: 117759123

Test: Running existing test com.android.nn.benchmark.app.NNTest
Change-Id: I099204527069e34209ac8a371efa2647703e64b5
diff --git a/assets/models_list/test_models.json b/assets/models_list/test_models.json
index 677f7f2..12aeee8 100644
--- a/assets/models_list/test_models.json
+++ b/assets/models_list/test_models.json
@@ -240,6 +240,7 @@
     {
       "name": "tts_float",
       "testName": "TTS_FLOAT",
+      "minSdkVersion": 29,
       "baselineSec": 0.004,
       "evaluator": {
           "className": "MelCepLogF0",