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.cpp b/server/BandwidthController.cpp
index 4abbc61..5b08819 100644
--- a/server/BandwidthController.cpp
+++ b/server/BandwidthController.cpp
@@ -291,15 +291,7 @@
     return 0;
 }
 
-int BandwidthController::enableBandwidthControl(bool force) {
-    char value[PROPERTY_VALUE_MAX];
-
-    if (!force) {
-            property_get("persist.bandwidth.enable", value, "1");
-            if (!strcmp(value, "0"))
-                    return 0;
-    }
-
+int BandwidthController::enableBandwidthControl() {
     /* Let's pretend we started from scratch ... */
     mSharedQuotaIfaces.clear();
     mQuotaIfaces.clear();