drm/xe: Restore pci state upon resume

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: f6761c68c0ac ("drm/xe/display: Improve s2idle handling.")
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Lucas De Marchi <lucas.demarchi@intel.com>
Reviewed-by: Jonathan Cavitt <jonathan.cavitt@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240912214507.456897-1-rodrigo.vivi@intel.com
Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>