BT: Adpot BLUETOOTH_PRIVILEGED permission in CTS test

* BluetoothLeBroadcastAssistant interface requires BLUETOOTH_PRIVILEAGED
  permission as they are system APIs

Bug: 231393538
Fixes: 231393538
Test: atest CtsBluetoothTestCases
Change-Id: Iae18dcd66f50b203c6f59bbce288f59d71178d3f
1 file changed