InteractionHandler calls undo_hint_action in a separate thread, where
undo_hint_action manipulates a linklist which is not protected by any
locking method.
std::lock_guard<std::mutex> lk(mLock) protects insides
InteractionHandler class, but the linklist is also used in other places
of PowerHAL such as Encoder hint.
Bug: 71383315
Test: Build
Change-Id: I81e2c79ab78ed7bd13ddc663ddbe86fa08f29337