Migrate frameworks/opt/telephony to androidx.test

See go/jetpack-test-android-migration

Test: make checkbuild
Change-Id: I54935b2665a54474e3f4e833f9c3fd90cd5e0726
diff --git a/tests/telephonytests/AndroidManifest.xml b/tests/telephonytests/AndroidManifest.xml
index 35ed2fb..3fbaacc 100644
--- a/tests/telephonytests/AndroidManifest.xml
+++ b/tests/telephonytests/AndroidManifest.xml
@@ -28,7 +28,7 @@
             </intent-filter>
         </activity>
     </application>
-    <instrumentation android:name="android.support.test.runner.AndroidJUnitRunner"
+    <instrumentation android:name="androidx.test.runner.AndroidJUnitRunner"
         android:targetPackage="com.android.frameworks.telephonytests"
         android:label="Frameworks Telephony Tests">
     </instrumentation>