Represent NAN callback events as a bitmap am: 3f7bfd2dc5 am: 6b039c37e5 am: 43eead8e5b

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

Change-Id: Ie15e9456fcc2b614985ca0c5054e7a452d903d95
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>