Staging: rtl8723bs: remove useless structs in wlan_bssdef.h

Remove the following unreferenced struct's in include/wlan_bssdef.h:

	struct ndis_802_11_association_information
	struct ndis_802_11_key
	struct ndis_802_11_remove_key

Signed-off-by: Marco Cesati <marcocesati@gmail.com>
Link: https://lore.kernel.org/r/20210322133717.17797-7-marcocesati@gmail.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>