Staging: wlan-ng: Consolidate wlan-ng into a single module.

There's no point in having a separate 'p80211' module, as nobody else is
ever going to use it.  Push everyting into a single module, and get rid
of all exports.

Signed-off-by: Solomon Peachy <pizza@shaftnet.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>