SystemServer: shell cmd Add enableBle & DisableBle

This will simulate an app trying to connect and activate BLE_ON mode.
It is very useful when testing on aosp without any sytemservice that try
to bind to Bluetooth in ble only.

Both the command are privileged and required root privileged

Bug: 311772251
Test: m Bluetooth : This is a test command:
      adb shell cmd bluetooth_manager enableBle
Flag: Exempt, test only
Change-Id: I7de3daa8ba60d878fd22c897d918d6aeafb2d6da