Merge "inputflinger: add missing <functional> include" into main am: 3508150e04 am: 041b86fec7

Original change: https://android-review.googlesource.com/c/platform/frameworks/native/+/2758333

Change-Id: I69272ad4225656b93cd948942b90338644d68c60
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>