Make textclassifier test backward compatible

Test: atest CtsTextClassifierTestCases
Bug: 160006699

Change-Id: I358f30ded3b8ffdb93dd64df5fd3a1826ddcf940
diff --git a/tests/tests/textclassifier/Android.bp b/tests/tests/textclassifier/Android.bp
index cad6924..ffd193f 100644
--- a/tests/tests/textclassifier/Android.bp
+++ b/tests/tests/textclassifier/Android.bp
@@ -36,4 +36,5 @@
         "src/**/*.java",
     ],
     sdk_version: "test_current",
+    min_sdk_version: "29",
 }
diff --git a/tests/tests/textclassifier/QueryTextClassifierServiceActivity/Android.bp b/tests/tests/textclassifier/QueryTextClassifierServiceActivity/Android.bp
index 17dd73c..f8c9dc4 100644
--- a/tests/tests/textclassifier/QueryTextClassifierServiceActivity/Android.bp
+++ b/tests/tests/textclassifier/QueryTextClassifierServiceActivity/Android.bp
@@ -26,4 +26,5 @@
         "mts"
     ],
     srcs: ["src/**/*.java"],
-}
\ No newline at end of file
+    min_sdk_version: "29",
+}