GD: Implement Wakelock Manager and Native Wakelock

* Implement Wakelock Manager to support both OS callout-based wakelocks
  and Android native wakelocks
* Use ISystemSuspend for Android native wakelocks
* Allow runtime override of wakelock callout to bypass the native
  implementation
* Implement unit test for both native and OS callout wakelocks

Bug: 184608842
Bug: 188614066
Tag: #gd-refactor
Test: atest bluetooth_test_gd_unit
BYPASS_LONG_LINES_REASON: Bluetooth likes 120 lines

Change-Id: I428e06e6a48a423bb6912e3449895e030e0dd073