Add hidden utils and constants to NetworkStack

Test: atest FrameworksNetTests NetworkStackTests
Bug: 112869080
Change-Id: I1a803f7954ab760294436226d6c1cffb934e98f9
diff --git a/Android.bp b/Android.bp
index a65ab90..cf6dd07 100644
--- a/Android.bp
+++ b/Android.bp
@@ -861,13 +861,17 @@
         "core/java/android/annotation/NonNull.java",
         "core/java/android/annotation/Nullable.java",
         "core/java/android/annotation/IntDef.java",
+        "core/java/android/annotation/IntRange.java",
         "core/java/android/annotation/UnsupportedAppUsage.java",
+        "core/java/android/net/DhcpResults.java",
         "core/java/android/util/LocalLog.java",
         "core/java/com/android/internal/annotations/VisibleForTesting.java",
         "core/java/com/android/internal/util/HexDump.java",
+        "core/java/com/android/internal/util/IndentingPrintWriter.java",
         "core/java/com/android/internal/util/IState.java",
         "core/java/com/android/internal/util/MessageUtils.java",
         "core/java/com/android/internal/util/Preconditions.java",
+        "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/WakeupMessage.java",