Staging: rtl8723bs: remove useless structs in ieee80211.h

Staging: rtl8723bs: remove useless structs in ieee80211.h

Remove the following unreferenced struct's in include/ieee80211.h:

	struct ieee_ibss_seq
	struct ieee80211_rx_stats
	struct ieee80211_frag_entry
	struct ieee80211_stats
	struct ieee80211_softmac_stats
	struct ieee80211_security
	struct ieee80211_header_data

Signed-off-by: Marco Cesati <marcocesati@gmail.com>
Link: https://lore.kernel.org/r/20210322133717.17797-18-marcocesati@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>