drm/xe: Restore pci state upon resume

The pci state was saved, but not restored. Restore
right after the power state transition request like
every other driver.

v2: Use right fixes tag, since this was there initialy, but
    accidentally removed.

Fixes: f6761c6 ("drm/xe/display: Improve s2idle handling.")
Cc: Maarten Lankhorst <[email protected]>
Cc: Lucas De Marchi <[email protected]>
Reviewed-by: Jonathan Cavitt <[email protected]>
Signed-off-by: Rodrigo Vivi <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]
Signed-off-by: Maarten Lankhorst <[email protected]>
(cherry picked from commit ec2d153)
Signed-off-by: Lucas De Marchi <[email protected]>

drivers/gpu/drm/xe/xe_pci.c

@@ -924,6 +924,8 @@ static int xe_pci_resume(struct device *dev)
 	if (err)
 		return err;
 
+	pci_restore_state(pdev);
+
 	err = pci_enable_device(pdev);
 	if (err)
 		return err;