Fix fingerprint aidl race condition then thread is join
Even if the shared variable is atomic, it must be modified under the mutex in order to correctly publish the modification to the waiting thread. There is a chance that mThread will miss both mIsDestructing and notify event without a mutex. Bug: 231737939 Test: manual Change-Id: If83a94b766c816b9e4897acb1e89eacdce880c15
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