BluetoothExt: Enable BT Ext app for compilation

Enable FTP and Dun for compilation.

FTP: Start FTP and dun servers after boot complete .

Use case:
1) Turn on the Bluetooth
2) Restart DUT
Error :
FTP receiver Not received BT Turn on Intent .
Fix:
After boot complete event start FTP and dun servers
if BT is enabled.

Change-Id: I85d717130c48e584bedfdbea3e7ee84a0c1b47aa