[MS54.3] Move NetworkStats to updatable sources

This CL builds NetworkStats related codes with the
connectivity module instead of platform.

Ignore-AOSP-First: Avoiding conflicts; cherry-pick will follow
Test: TH
Bug: 197717846
Change-Id: I4eeb7ea9cfc3139991caf0fc22474e0052a0391c
diff --git a/framework-t/api/removed.txt b/framework-t/api/removed.txt
index d802177..1ba87d8 100644
--- a/framework-t/api/removed.txt
+++ b/framework-t/api/removed.txt
@@ -1 +1,9 @@
 // Signature format: 2.0
+package android.net {
+
+  public class TrafficStats {
+    method @Deprecated public static void setThreadStatsUidSelf();
+  }
+
+}
+