Rename entitlement callback to adhere to API guidelines.

The method for OnTetheringEntitlementResultListener needs to be
onTetheringEntitlementResult in order to meet our API guidelines:

"Use Listener when there is a single callback method and there will
never be any others. It should be an interface whose name is the same
as the callback method plus Listener."

Bug: 126392011
Change-Id: I9a883765541ae853c4eb3bd52c9d93a7af16e661
Test: Manual build
diff --git a/core/java/android/net/ConnectivityManager.java b/core/java/android/net/ConnectivityManager.java
index b7ba970..99b5664 100644
--- a/core/java/android/net/ConnectivityManager.java
+++ b/core/java/android/net/ConnectivityManager.java
@@ -2805,7 +2805,7 @@
          *         {@link #TETHER_ERROR_PROVISION_FAILED}, or
          *         {@link #TETHER_ERROR_ENTITLEMENT_UNKONWN}.
          */
-        void onEntitlementResult(@EntitlementResultCode int resultCode);
+        void onTetheringEntitlementResult(@EntitlementResultCode int resultCode);
     }
 
     /**
@@ -2855,7 +2855,7 @@
             protected void onReceiveResult(int resultCode, Bundle resultData) {
                 Binder.withCleanCallingIdentity(() ->
                             executor.execute(() -> {
-                                listener.onEntitlementResult(resultCode);
+                                listener.onTetheringEntitlementResult(resultCode);
                             }));
             }
         };