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: Ieeedf78227b243b2b4ba0c4b13772033b04019c3
Signed-off-by: Carlos Galo <carlosgalo@google.com>
3 files changed