staging: rtl8723au: Don't carry ht_cap_info and ht_param in struct wlan_bcn_info

These were just stored to check whether the beacon info had changed
and print a debug message in this case. If we ever need this again, we
can determine this change differently.

Signed-off-by: Jes Sorensen <Jes.Sorensen@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>