greybus: Remove legacy suspend/resume callbacks

We should be using the PM hooks available within the 'struct
device_driver', instead of adding legacy suspend/resume callbacks.
Remove them.
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

drivers/staging/greybus/greybus.h

@@ -62,9 +62,6 @@ struct greybus_driver {
 		     const struct greybus_bundle_id *id);
 	void (*disconnect)(struct gb_bundle *bundle);
 
-	int (*suspend)(struct gb_bundle *bundle, pm_message_t message);
-	int (*resume)(struct gb_bundle *bundle);
-
 	const struct greybus_bundle_id *id_table;
 
 	struct device_driver driver;