Fix TSCH_AUTOSELECT_TIME_SOURCE to work with 2-byte addresses and with the new nbr_table_add_lladdr interface
Fix TSCH_AUTOSELECT_TIME_SOURCE to work with 2-byte addresses and with the new nbr_table_add_lladdr interface

MohamedSeliem/contiki,arurke/contiki,MohamedSeliem/contiki,MohamedSeliem/contiki,arurke/contiki,MohamedSeliem/contiki,arurke/contiki,MohamedSeliem/contiki,arurke/contiki,arurke/contiki,MohamedSeliem/contiki,MohamedSeliem/contiki,arurke/contiki,arurke/contiki