USB: Turn on auto-suspend for USB 3.0 hubs.

Now that USB 3.0 hub remote wakeup on port status changes is enabled,
and USB 3.0 device remote wakeup is handled in the USB core properly,
let's turn on auto-suspend for all USB 3.0 hubs.
Signed-off-by: NSarah Sharp <sarah.a.sharp@linux.intel.com>

drivers/usb/core/hub.c

@@ -1315,14 +1315,8 @@ static int hub_probe(struct usb_interface *intf, const struct usb_device_id *id)
 	desc = intf->cur_altsetting;
 	hdev = interface_to_usbdev(intf);
 
-	/* Hubs have proper suspend/resume support.  USB 3.0 device suspend is
-	 * different from USB 2.0/1.1 device suspend, and unfortunately we
-	 * don't support it yet.  So leave autosuspend disabled for USB 3.0
-	 * external hubs for now.  Enable autosuspend for USB 3.0 roothubs,
-	 * since that isn't a "real" hub.
-	 */
-	if (!hub_is_superspeed(hdev) || !hdev->parent)
-		usb_enable_autosuspend(hdev);
+	/* Hubs have proper suspend/resume support. */
+	usb_enable_autosuspend(hdev);
 
 	if (hdev->level == MAX_TOPO_LEVEL) {
 		dev_err(&intf->dev,