hostapd: fix build when 80211BE enabled

hostapd: fix build when 80211BE enabled

In file included from hostapd-wpad-basic-mbedtls/hostapd-2024.03.09~695277a5/src/ap/ubus.h:11,
                 from hostapd-wpad-basic-mbedtls/hostapd-2024.03.09~695277a5/src/ap/hostapd.h:21,
                 from main.c:26:
hostapd-2024.03.09~695277a5/src/ap/sta_info.h: In function 'ap_sta_is_mld':
hostapd-2024.03.09~695277a5/src/ap/sta_info.h:425:20: error: invalid use of undefined type 'struct hostapd_data'
  425 |         return hapd->conf->mld_ap && sta && sta->mld_info.mld_sta;
      |                    ^~

Signed-off-by: Janusz Dziedzic <janusz.dziedzic@gmail.com>