service: Don't crash for notifications with data source in wrong state
service: Don't crash for notifications with data source in wrong state

Notifications can be asynchronous, so e.g. the data source may already
have been told to stop by the time the DataSourceStarted notification
arrives at the service. Just warn in these instances instead.

Bug: 127948038
Change-Id: I1098acd42f06be74df0a8afc686528978915dcbd
google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto