s390/virtio: remove unused pm callbacks

Support for hibernation on s390 has been recently been removed with
commit 394216275c ("s390: remove broken hibernate / power management
support"), no need to keep unused code around.

Link: https://lkml.kernel.org/r/20200526093629.257649-1-cohuck@redhat.com
Signed-off-by: Cornelia Huck <cohuck@redhat.com>
Reviewed-by: Halil Pasic <pasic@linux.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>

drivers/s390/virtio/virtio_ccw.c

@@ -1372,27 +1372,6 @@ static struct ccw_device_id virtio_ids[] = {
 	{},
 };
 
-#ifdef CONFIG_PM_SLEEP
-static int virtio_ccw_freeze(struct ccw_device *cdev)
-{
-	struct virtio_ccw_device *vcdev = dev_get_drvdata(&cdev->dev);
-
-	return virtio_device_freeze(&vcdev->vdev);
-}
-
-static int virtio_ccw_restore(struct ccw_device *cdev)
-{
-	struct virtio_ccw_device *vcdev = dev_get_drvdata(&cdev->dev);
-	int ret;
-
-	ret = virtio_ccw_set_transport_rev(vcdev);
-	if (ret)
-		return ret;
-
-	return virtio_device_restore(&vcdev->vdev);
-}
-#endif
-
 static struct ccw_driver virtio_ccw_driver = {
 	.driver = {
 		.owner = THIS_MODULE,
@@ -1405,11 +1384,6 @@ static struct ccw_driver virtio_ccw_driver = {
 	.set_online = virtio_ccw_online,
 	.notify = virtio_ccw_cio_notify,
 	.int_class = IRQIO_VIR,
-#ifdef CONFIG_PM_SLEEP
-	.freeze = virtio_ccw_freeze,
-	.thaw = virtio_ccw_restore,
-	.restore = virtio_ccw_restore,
-#endif
 };
 
 static int __init pure_hex(char **cp, unsigned int *val, int min_digit,