staging: rtl8188eu: use common packet header constants

The driver replicates the definitions of rfc1042_header and
bridge_tunnel_header available from cfg80211.h. Use the common
ones from cfg80211.h.

Signed-off-by: Michael Straube <straube.linux@gmail.com>
Link: https://lore.kernel.org/r/20200619160328.22776-1-straube.linux@gmail.com


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