staging: r8188eu: remove unused structs from ieee80211.h

There are lots of unused structures in the ieee80211.h header.
Remove them.

Signed-off-by: Michael Straube <straube.linux@gmail.com>
Link: https://lore.kernel.org/r/20220210101623.13758-2-straube.linux@gmail.com


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