Represent NAN callback events as a bitmap am: 3f7bfd2dc5 am: 6b039c37e5 am: 0804b6fd0e

Original change: https://googleplex-android-review.googlesource.com/c/platform/hardware/interfaces/+/24029040

Change-Id: I704aec6c665e0cc26aaeb28702a1273309ac8c5d
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>