Merge "libbinder: LazyServiceRegistrar documentation" am: 02d7e69f93 am: 7baa467475 am: 5dfc123171

Original change: https://android-review.googlesource.com/c/platform/frameworks/native/+/1391126

Change-Id: I4918dd7284d150cf63e9e2a9f97c19ffb09ddc1c