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/Controllers.cpp b/server/Controllers.cpp
index f590307..409d243 100644
--- a/server/Controllers.cpp
+++ b/server/Controllers.cpp
@@ -283,8 +283,8 @@
     gLog.info("Initializing traffic control: %.1fms", s.getTimeAndReset());
 
     bandwidthCtrl.setBpfEnabled(trafficCtrl.checkBpfStatsEnable());
-    bandwidthCtrl.enableBandwidthControl(false);
-    gLog.info("Disabling bandwidth control: %.1fms", s.getTimeAndReset());
+    bandwidthCtrl.enableBandwidthControl();
+    gLog.info("Enabling bandwidth control: %.1fms", s.getTimeAndReset());
 
     if (int ret = RouteController::Init(NetworkController::LOCAL_NET_ID)) {
         gLog.error("Failed to initialize RouteController (%s)", strerror(-ret));