staging: rtl8723au: rtw_survey_event_cb23a(): Remember to clone beacon data

We need to clone all the beacon information, not just the IE data, in
particular as the long term goal is to stop carrying this information
in the IE data.

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