greybus: svc: connection: ask SVC to create connections

Ask the SVC to do all the necessary bits for creating a new connection.
This is skipped for the initial SVC connection.

Tested-by: Viresh Kumar <viresh.kumar@linaro.org>
Reviewed-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Perry Hung <perry@leaflabs.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>