memevents: Create new API to verify listener state

Expose an API that allows the client to know whether or not the bpf ring
buffer manager was initialized correctly.

Test: atest memevents_test
Bug: 330393131
Change-Id: I69400486bfa942f446620bce3868b5a24bd8bf84
Signed-off-by: Carlos Galo <carlosgalo@google.com>
3 files changed