Reference tzdata3 for S, not tzdata2

tzdata2 is being renamed to tzdata3 for S. This commit adds references
to tzdata3.

Bug: 173708701
Bug: 172352808
Test: build only
Change-Id: I8389fc7dd56932bf2c01b7795eafa78fa02a6c2f
diff --git a/apex/tests/AndroidTest.xml b/apex/tests/AndroidTest.xml
index c9a547a..1981a5b 100644
--- a/apex/tests/AndroidTest.xml
+++ b/apex/tests/AndroidTest.xml
@@ -30,7 +30,9 @@
     <object type="module_controller" class="com.android.tradefed.testtype.suite.module.MainlineTestModuleController">
         <!-- This module is found on Q devices. -->
         <option name="mainline-module-package-name" value="com.google.android.tzdata" />
-        <!-- This module is found on R+ devices. -->
+        <!-- This module is found on R devices. -->
         <option name="mainline-module-package-name" value="com.google.android.tzdata2" />
+        <!-- This module is found on S devices. -->
+        <option name="mainline-module-package-name" value="com.google.android.tzdata3" />
     </object>
 </configuration>