Netd unconditionally enable bandwidth control

Remove corresponding netd command, and default enable bandwidth
controller.

Test: The bindwith control start correctly on new devices.
Change-Id: I05e1bd365af1edfade28d445cec897cc6b6b2f08
diff --git a/server/BandwidthController.h b/server/BandwidthController.h
index 621f5b9..bc27c07 100644
--- a/server/BandwidthController.h
+++ b/server/BandwidthController.h
@@ -34,7 +34,7 @@
     int setupIptablesHooks();
     void setBpfEnabled(bool isEnabled);
 
-    int enableBandwidthControl(bool force);
+    int enableBandwidthControl();
     int disableBandwidthControl();
     int enableDataSaver(bool enable);