SDK / exoplayer

The `@CallSuper` annotation should help catch cases where subclasses are
calling `delegate.addListener` instead of `super.addListener` but it
will also (unintentionally) prevent subclasses from either completely
no-opping the listener registration, or implementing it themselves in a
very custom way. I think that's probably OK, since these cases are
probably unusual, and they should be able to suppress the warning/error.

Issue: androidx/media#258

#minor-release

PiperOrigin-RevId: 513848402
(cherry picked from commit 5d23a929)