GD-HCI: Send original command instead of status packet upwards

* Legacy stack expects original command when command status is available
* Add verbose logging for command complete and command status
* Wrap pending command in OsiObject so that it can be auto-freed by
  C++ unique_ptr

Bug: 165181021
Test: make, flash, test A2DP and HFP
Tag: #gd-refactor
Change-Id: Iddb20c405dc2f0326de53d3531464cbba65d6076