staging: omapdrm: use alloc_ordered_workqueue() instead of UNBOUND w/ max_active = 1

This is an equivalent conversion and will ease scheduled removal of
WQ_NON_REENTRANT.

Only compile tested.
Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Rob Clark <rob@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/omapdrm/omap_drv.c

@@ -571,8 +571,7 @@ static int dev_load(struct drm_device *dev, unsigned long flags)
 
 	dev->dev_private = priv;
 
-	priv->wq = alloc_workqueue("omapdrm",
-			WQ_UNBOUND | WQ_NON_REENTRANT, 1);
+	priv->wq = alloc_ordered_workqueue("omapdrm", 0);
 
 	INIT_LIST_HEAD(&priv->obj_list);