drm/xe: Nuke xe from xe_devcoredump

xe is never set in xe_devcoredump but if xe_device is needed
devcoredump_to_xe_device() can be used.

Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Maarten Lankhorst <dev@lankhorst.se>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: José Roberto de Souza <jose.souza@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240123204454.246788-3-jose.souza@intel.com

drivers/gpu/drm/xe/xe_devcoredump_types.h

@@ -44,8 +44,6 @@ struct xe_devcoredump_snapshot {
  * for reading the information.
  */
 struct xe_devcoredump {
-	/** @xe: Xe device. */
-	struct xe_device *xe;
 	/** @captured: The snapshot of the first hang has already been taken. */
 	bool captured;
 	/** @snapshot: Snapshot is captured at time of the first crash */