MBO: Add MBO ANQP-element processing on AP

This extends the GAS server to process MBO ANQP-elements and reply to a
query for the Cellular Data Connection Preference (if configured). The
new configuration parameter mbo_cell_data_conn_pref can be used to set
the value (0, 1, or 255) for the preference to indicate.

Signed-off-by: Jouni Malinen <jouni@qca.qualcomm.com>

src/ap/ap_config.c

@@ -109,6 +109,10 @@ void hostapd_config_defaults_bss(struct hostapd_bss_config *bss)
 #endif /* CONFIG_FILS */
 
 	bss->broadcast_deauth = 1;
+
+#ifdef CONFIG_MBO
+	bss->mbo_cell_data_conn_pref = -1;
+#endif /* CONFIG_MBO */
 }