Adding receiver exported flag.

Since the broadcast receiver in question is permission protected we will add a RECEIVER_EXPORTED flag to make this receiver compatible with Android T+.

Change-Id: Ib6453b47641a32796e202f4f9e37099c36b6c683
Test:no-op
Bug:161145287

src/com/android/settings/wifi/tether/TetherService.java

@@ -119,7 +119,8 @@ public class TetherService extends Service {
         if (mExpectedProvisionResponseAction != null) unregisterReceiver(mReceiver);
 
         registerReceiver(mReceiver, new IntentFilter(responseAction),
-                android.Manifest.permission.TETHER_PRIVILEGED, null /* handler */);
+                android.Manifest.permission.TETHER_PRIVILEGED, null /* handler */,
+                Context.RECEIVER_EXPORTED);
         mExpectedProvisionResponseAction = responseAction;
         if (DEBUG) Log.d(TAG, "registerReceiver " + responseAction);
     }