usb: xhci: Don't check for USB_STATE_NOTATTACHED in sec_event_ring_cleanup

Similar to xhci_stop_endpoint(), this API is called when a device
is removed. The check for udev->state == USB_STATE_NOTATTACHED
was added by mistake and should be removed.

Change-Id: Ie0df67c3139bd585f098215d093169c961710349
Signed-off-by: Jack Pham <jackp@codeaurora.org>