Staging: hv: Get rid of cleanup from struct hv_driver

Now that we have removed calls to this empty function, get rid of the
unnecessary state in struct hv_driver.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: Abhishek Kane <v-abkane@microsoft.com>
Signed-off-by: Hank Janssen <hjanssen@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/hv/vmbus_api.h

@@ -96,8 +96,6 @@ struct hv_driver {
 
 	struct device_driver driver;
 
-	void (*cleanup)(struct hv_driver *driver);
-
 	int (*probe)(struct hv_device *);
 	int (*remove)(struct hv_device *);
 	void (*shutdown)(struct hv_device *);