staging: rtl8723au: Remove P2P/WiFiDirect/WiFiDisplay code

Discussing with Johannes Berg and Larry Finger, we have concluded that
this code really should be handled through wpa_supplicant, and not in
the kernel.

Signed-off-by: Jes Sorensen <Jes.Sorensen@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>