GD: Hold wakelock when starting and stopping the Bluetooth stack

* Hold wakelock when starting and stopping the Bluetooth stack so that it
  can meet the timing requirement
* Rename GD wakelock to bluetooth_gd_timer for easier debugging
* Use native HAL based wakelock in GD

Bug: 184608842
Tag: #gd-refactor
Test: atest bluetooth_test_gd_unit
BYPASS_LONG_LINES_REASON: Bluetooth likes 120 lines

Change-Id: Ib4679782061b82a70a240a2a614f7ee587e5c7c7