Fail silently when changing BLUETOOTH_ON/WIFI_ON directly

If the device owner tries to change BLUETOOTH_ON or WIFI_ON via
DevicePolicyManager.setGlobalSetting, fail silently.

There was not much point for the device owner to do it since it can
also change bluetooth/wifi state via normal bluetooth and wifi apis.

BUG:19311992

Change-Id: Ifba163800aa413865b8a2877cb21aacfa5cfc6c8