audio: Fix the comment about threading of DriverInterface::init am: 3755134720 am: 1d0e427c27 am: 44ee5be311

Original change: https://android-review.googlesource.com/c/platform/hardware/interfaces/+/2597780

Change-Id: I54855c70dbc949c327bd737a11b31c23e56cf893
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>