Drop all hostapd STA entries on interface disabled event

If the driver indicates that the interface has been disabled, assume
that all associations have been lost and remove the hostapd STA entries.

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

src/ap/drv_callbacks.c

@@ -1222,6 +1222,7 @@ void wpa_supplicant_event(void *ctx, enum wpa_event_type event,
 		}
 		break;
 	case EVENT_INTERFACE_DISABLED:
+		hostapd_free_stas(hapd);
 		wpa_msg(hapd->msg_ctx, MSG_INFO, INTERFACE_DISABLED);
 		hapd->disabled = 1;
 		break;