Disable monitor status ring support in qwx(4).

Disable monitor status ring support in qwx(4).

The ring isn't needed to scan for APs. This ring's ext interrupt fires
continously and we somehow end up with mbuf corruption which looks
like an mcl2k cluster overwrite (this bug is present even before the
changes added in my previous commit). Disable this code path for now
to work around the corruption, allowing work on this driver to proceed.