NetworkMonitorManager should just be a passthrough wrapper for
INetworkMonitor. Move logic to choose the notifyNetworkConnected version
to call to its only caller, ConnectivityService.
This allows removing the dependency on modules-utils-build, which makes
the networkstack-client library less portable; for example it would add
duplicate classes if networkstack-client is included into service-wifi,
as service-wifi can already use modules-utils-build from framework-wifi.
Fixes: 227161380
Test: atest ConnectivityServiceTest
Change-Id: Ie50f586c5d1ffe021cb0a96294f13f478fd3a2dd
9ada184a2b