staging: rtl8192e: Add cfg80211.h and remove defined variables

Add cfg80211 and remove defined variables rfc1042_header and
bridge_tunnel_header as they are then already defined. Usage of cfg80211
is required to merge driver into wireless subsystem.

Signed-off-by: Philipp Hortmann <philipp.g.hortmann@gmail.com>
Message-ID: <20230603085251.GA20230@matrix-ESPRIMO-P710>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>