Avoid Bluetooth gets turned on by enableBle

BluetoothHandler was not able to tell whether the MESSAGE_ENABLE was
from enable() or enableBle(), which sometimes lead to Bluetooth gets
turned to STATE_ON by an enableBle() call.

Fix this problem by adding a BLE specific argument in the message to
differ the calls.

Bug: 191404687
Test: Manual
Change-Id: Ic9df612ec0e396932df2fb3bf3a5874bd4e7443c