having it as a MediaEndpoint I guess it is probably a good idea to
have a similar design as we will have in endpoints, so the
registration actually happen in adapter path rather than device path,
which probably should avoid the having to resolve the device path
while probing if we just send the device path as a parameter of
NewConnection so we can do while in DEFER_SETUP stage so we don't risk
missing or getting timeouts while transferring the the fd to ofono.
Personally I like this to be a per-device agent rather than per-adapter as it
will make agent code inside oFono a bit easier to write. Marcel / Johan, care
to weigh in?