Properly disconnect after skipping an operation.

If we skip an operation we used to just return. This lead to the service
staying connected, holding the wakelock and consuming power.

Hence after we skip an operation we need to check if we can disconnect
the service, basically treating skipping an operation similar failing
to execute the operation.

Fixes: 77766977
Test: Detected music via sound trigger service and triggered dropping of
operations

Change-Id: Ia837d628193b3a5c2763f4aae666193d624b6d7f