Change TetheringConstants class to final

Bug: 151322331
Test: m doc-comment-check-docs

Change-Id: Ieca36d81b7799988b8dbb9c0d22de690136303ab
Merged-In: Ia02be3d1d91a08ae4a56b25560ed448c96a693db
(cherry picked from commit 5e2740b24658ba340a6b47a46c89cfd642afe394)
diff --git a/api/module-lib-current.txt b/api/module-lib-current.txt
index 69b52693..ee997f1 100644
--- a/api/module-lib-current.txt
+++ b/api/module-lib-current.txt
@@ -29,7 +29,7 @@
     field @NonNull public static final android.os.Parcelable.Creator<android.net.TetheredClient.AddressInfo> CREATOR;
   }
 
-  public class TetheringConstants {
+  public final class TetheringConstants {
     field public static final String EXTRA_ADD_TETHER_TYPE = "extraAddTetherType";
     field public static final String EXTRA_PROVISION_CALLBACK = "extraProvisionCallback";
     field public static final String EXTRA_REM_TETHER_TYPE = "extraRemTetherType";