intel_ips: Remove empty legacy PM callbacks

The legacy PM callbacks provided by the Intel IPS driver are
empty routines returning 0, so they can be safely dropped.
Signed-off-by: NRafael J. Wysocki <rjw@sisk.pl>
Acked-by: NJesse Barnes <jbarnes@virtuousgeek.org>

drivers/platform/x86/intel_ips.c

@@ -1697,21 +1697,6 @@ static void ips_remove(struct pci_dev *dev)
 	dev_dbg(&dev->dev, "IPS driver removed\n");
 }
 
-#ifdef CONFIG_PM
-static int ips_suspend(struct pci_dev *dev, pm_message_t state)
-{
-	return 0;
-}
-
-static int ips_resume(struct pci_dev *dev)
-{
-	return 0;
-}
-#else
-#define ips_suspend NULL
-#define ips_resume NULL
-#endif /* CONFIG_PM */
-
 static void ips_shutdown(struct pci_dev *dev)
 {
 }
@@ -1721,8 +1706,6 @@ static struct pci_driver ips_pci_driver = {
 	.id_table = ips_id_table,
 	.probe = ips_probe,
 	.remove = ips_remove,
-	.suspend = ips_suspend,
-	.resume = ips_resume,
 	.shutdown = ips_shutdown,
 };