Make tetherChangePermission to be secured for AppOps permission

Symptom:
AppOps verified the incorrect package of calling tether state
changing API.
It threw SecurityException by mistake.

Solution:
Pass the correct package name to enforceTetherChangePermission.

Bug: 32931147
Change-Id: Ief21324eee02d6215d9bff681ccad435815bea04
diff --git a/service/java/com/android/server/wifi/util/WifiPermissionsUtil.java b/service/java/com/android/server/wifi/util/WifiPermissionsUtil.java
index 6de39ac..8b687db 100644
--- a/service/java/com/android/server/wifi/util/WifiPermissionsUtil.java
+++ b/service/java/com/android/server/wifi/util/WifiPermissionsUtil.java
@@ -81,7 +81,8 @@
      * @param context Context object of the caller.
      */
     public void enforceTetherChangePermission(Context context) {
-        ConnectivityManager.enforceTetherChangePermission(context);
+        String pkgName = context.getOpPackageName();
+        ConnectivityManager.enforceTetherChangePermission(context, pkgName);
     }
 
     /**