GD-Controller: Do not register NumberOfCompletedPacket without ACL layer

* Only register it when ACL layer is enabled
* Also hci layer event is only registered by HCI lyaer when HCI layer
  is enabled

Test: make, pair and connect Bluetooth devices
Bug: 170603745
Tag: #gd-refactor
Change-Id: Icc94d239c28ba58ceffebee1061b4f8042afecc5