btaa: handle wakelock notification

Handle wakelock acquire and release notification from system suspend
service and record the wakelock duration upon release.

Tag: #feature
Bug: 177232907
Test: verified locally BTAA can capture and timestamp BT wakelocks
BYPASS_LONG_LINES_REASON: consist with gd format

Change-Id: I51dfdbec62b66d5a93f45d8ea2c52a16ce3beec1