staging: rtl8723au: rtw_joinbss_update_network23a(): update beacon info as well

We need to copy over the beacon info (interval, capability, tsf) as
well as the IE data.

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