Revert "[Not for upstream] drm/xe: add DPM_FLAG_SMART_SUSPEND"

This reverts commit d8e79b5.

Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com>

Author: bardliao

drivers/gpu/drm/xe/xe_pci.c

@@ -860,8 +860,6 @@ static int xe_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 	if (err)
 		goto err_driver_cleanup;
 
-	dev_pm_set_driver_flags(&pdev->dev, DPM_FLAG_SMART_SUSPEND);
-
 	drm_dbg(&xe->drm, "d3cold: capable=%s\n",
 		str_yes_no(xe->d3cold.capable));