Merge "Add missing <functional> includes for std::function" into main am: f330930be2

Original change: https://android-review.googlesource.com/c/platform/system/extras/+/2673532

Change-Id: Ie08bbaa1c3f8ba82842ac998118f18ed6aa41f68
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>