Add missing function macros (ARMmbed#1897)

Author: Arto Kinnunen

source/6LoWPAN/Thread/thread_extension_bootstrap.h

@@ -71,6 +71,8 @@ int8_t thread_extension_bootstrap_network_reattach(int8_t interface_id, uint16_t
 #define thread_extension_bootstrap_thread_name_length_get(cur) (0)
 #define thread_extension_bootstrap_thread_name_ptr_get(cur) (NULL)
 #define thread_extension_bootstrap_network_certificate_enable(cur, coap_service_id) (NULL)
+#define thread_extension_bootstrap_reenrollment_start(cur, service_id, pbbr_addr) (-1)
+#define thread_extension_bootstrap_network_reattach(interface_id, timeout) (-1)
 #endif
 
 #ifdef __cplusplus