amd-xgbe: Fix unused suspend handlers build warning

Fix:

  drivers/net/ethernet/amd/xgbe/xgbe-main.c:835:12: warning: ‘xgbe_suspend’ defined
    but not used [-Wunused-function]
  drivers/net/ethernet/amd/xgbe/xgbe-main.c:855:12: warning: ‘xgbe_resume’ defined
    but not used [-Wunused-function]

I see it during randconfig builds here.
Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Cc: netdev@vger.kernel.org
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/amd/xgbe/xgbe-main.c

@@ -829,7 +829,7 @@ static int xgbe_remove(struct platform_device *pdev)
 	return 0;
 }
 
-#ifdef CONFIG_PM
+#ifdef CONFIG_PM_SLEEP
 static int xgbe_suspend(struct device *dev)
 {
 	struct net_device *netdev = dev_get_drvdata(dev);
@@ -874,7 +874,7 @@ static int xgbe_resume(struct device *dev)
 
 	return ret;
 }
-#endif /* CONFIG_PM */
+#endif /* CONFIG_PM_SLEEP */
 
 #ifdef CONFIG_ACPI
 static const struct acpi_device_id xgbe_acpi_match[] = {