greybus: connection: Call connection_destroy() from gb_connection_svc_connection_destroy()

connection_create() is called right after svc is requested to create the
connection and so connection_destroy() must be called just before we
request the SVC to destroy the connection.

Over that, this fixes the inconsistency where connection_create() is
called for all connections except SVC connection, but
connection_destroy() is called always.

Acked-by: Alexandre Bailon <abailon@baylibre.com>
Fixes: 5313ca607afb ("Greybus driver: add a new callbacks to driver")
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Reviewed-by: Johan Hovold <johan@hovoldconsulting.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>