Pass device deletion from acccept list through connection manager

Currently, when device bond is removed, BTM_SecDeleteDevice requests
device removal from accept list directly from shim.
GATT would also remove directly from accept list i.e. when operation
timeout happens.

If an app was to request connection after it, connection_manager would
be unaware of accept list modification, think we still have device in
it, and prevent further connections.

Test: atest net_test_conn_multiplexing
Bug: 372202918
Flag: EXEMPT, covered under unittests
Change-Id: I1a12681281cf82fad1889ee2b292ff4e587cea40