Move TrafficStats tags for the network stack constants

As per API council feedback, these constants should live in
a place that is private to the network stack, only with a
range defined in system API.

Bug: 129433383
Test: m
Change-Id: I84a90f84a9af6fef4667ee4d512ebd0413222086
(cherry picked from commit 79a6330650ca04bd7a08afbd63f8016a3b30bc72)
diff --git a/Android.bp b/Android.bp
index 6a85f62..65d16ac 100644
--- a/Android.bp
+++ b/Android.bp
@@ -923,6 +923,7 @@
         "core/java/com/android/internal/util/RingBufferIndices.java",
         "core/java/com/android/internal/util/State.java",
         "core/java/com/android/internal/util/StateMachine.java",
+        "core/java/com/android/internal/util/TrafficStatsConstants.java",
         "core/java/com/android/internal/util/WakeupMessage.java",
         "core/java/android/net/shared/*.java",
     ]