audio: Fix the comment about threading of DriverInterface::init am: 3755134720 am: 1d0e427c27 am: 44ee5be311 am: c4d15dc1e2 am: 248f01accc am: d1bacbae5f

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

Change-Id: Ie2817c028bab0cb5f7aceea66018208695bccf8f
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>