drm/xe: Only set PCI d3cold_allowed when we are really allowing.

First of all it was strange to see:
if (allowed) {
...
} else {
   D3COLD_ENABLE
}

But besides this misalignment, let's also use the pci
d3cold_allowed useful to us and know that we are not really
allowing d3cold.

Cc: Anshuman Gupta <anshuman.gupta@intel.com>
Reviewed-by: Anshuman Gupta <anshuman.gupta@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>

drivers/gpu/drm/xe/xe_pci.c

@@ -766,6 +766,7 @@ static int xe_pci_runtime_suspend(struct device *dev)
 	pci_save_state(pdev);
 
 	if (xe->d3cold.allowed) {
+		d3cold_toggle(pdev, D3COLD_ENABLE);
 		pci_disable_device(pdev);
 		pci_ignore_hotplug(pdev);
 		pci_set_power_state(pdev, PCI_D3cold);
@@ -795,8 +796,6 @@ static int xe_pci_runtime_resume(struct device *dev)
 			return err;
 
 		pci_set_master(pdev);
-	} else {
-		d3cold_toggle(pdev, D3COLD_ENABLE);
 	}
 
 	return xe_pm_runtime_resume(xe);