staging: rtl8723au: Get rid of _rtw_free_network23a_nolock23a()

_rtw_free_network23a() and _rtw_free_network23a_nolock23a() are now
identical - one copy should do.

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