Migrate Messaging to androidx.

Test: make messaging
Bug: 76692459
Change-Id: I9103450622f129311545648ac75f5b2f9fc2d04a
diff --git a/res/layout/conversation_fragment.xml b/res/layout/conversation_fragment.xml
index 028e66b..0bf42f5 100644
--- a/res/layout/conversation_fragment.xml
+++ b/res/layout/conversation_fragment.xml
@@ -34,7 +34,7 @@
             android:layout_height="match_parent"
             android:layout_weight="1" >
             <!-- Message list -->
-            <android.support.v7.widget.RecyclerView
+            <androidx.recyclerview.widget.RecyclerView
                 android:id="@android:id/list"
                 android:layout_width="match_parent"
                 android:layout_height="match_parent"