s390/vmlogrdr: Remove power management support

Power management support was removed for s390 with
commit 39421627 ("s390: remove broken hibernate / power management
support").

Remove leftover vmlogrdr-related power management code.
Acked-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Peter Oberparleiter <oberpar@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>

drivers/s390/char/vmlogrdr.c

@@ -679,34 +679,10 @@ static const struct attribute_group *vmlogrdr_attr_groups[] = {
 	NULL,
 };
 
-static int vmlogrdr_pm_prepare(struct device *dev)
-{
-	int rc;
-	struct vmlogrdr_priv_t *priv = dev_get_drvdata(dev);
-
-	rc = 0;
-	if (priv) {
-		spin_lock_bh(&priv->priv_lock);
-		if (priv->dev_in_use)
-			rc = -EBUSY;
-		spin_unlock_bh(&priv->priv_lock);
-	}
-	if (rc)
-		pr_err("vmlogrdr: device %s is busy. Refuse to suspend.\n",
-		       dev_name(dev));
-	return rc;
-}
-
-
-static const struct dev_pm_ops vmlogrdr_pm_ops = {
-	.prepare = vmlogrdr_pm_prepare,
-};
-
 static struct class *vmlogrdr_class;
 static struct device_driver vmlogrdr_driver = {
 	.name = "vmlogrdr",
 	.bus  = &iucv_bus,
-	.pm = &vmlogrdr_pm_ops,
 	.groups = vmlogrdr_drv_attr_groups,
 };