[Provider Model] Pass null to the reason parameter to avoid unnecessary

bugreports

- The reason parameter may be used to generate bugreport

- Pass null to the reason parameter under normal situation

Bug: 178542910
Test: manual test
- make RunSettingsRoboTests ROBOTEST_FILTER=NetworkProviderSettingsTest

Merged-In: I469a8c72fc7a6ab057acef476296285bb8a62713
Change-Id: I469a8c72fc7a6ab057acef476296285bb8a62713
(cherry picked from commit 3c02095c90)

src/com/android/settings/network/NetworkProviderSettings.java

@@ -1167,7 +1167,7 @@ public class NetworkProviderSettings extends RestrictedSettingsFragment
                     getContext(), mRecoveryThread.getThreadHandler());
         }
         if (mConnectivitySubsystemsRecoveryManager.isRecoveryAvailable()) {
-            mConnectivitySubsystemsRecoveryManager.triggerSubsystemRestart(TAG, this);
+            mConnectivitySubsystemsRecoveryManager.triggerSubsystemRestart(null /* reason */, this);
         }
     }