Merge "Add missing include of <mutex>" into main am: 1612fe7f

Original change: https://android-review.googlesource.com/c/platform/hardware/interfaces/+/3115159



Change-Id: I0cc9717a758177a4e90c2971e58485891ca35a27
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>