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

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

Change-Id: Ice3646ac54c4adf579345ece0fb89edb85b6a8b8
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>