greybus: connection: don't send connected/disconnected events for SVC connection

SVC is also a special protocol (like control) and AP doesn't need to
send (dis)connected events for its cport.

Lets skip them.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>