batman-adv: Prefix main enum with BATADV_

net/batman-adv/bat_iv_ogm.c

net/batman-adv/bat_sysfs.c

net/batman-adv/bat_sysfs.h

net/batman-adv/bitarray.c

net/batman-adv/bridge_loop_avoidance.c

net/batman-adv/gateway_client.c

net/batman-adv/icmp_socket.c

net/batman-adv/main.c

net/batman-adv/main.h

net/batman-adv/originator.c

net/batman-adv/routing.c

net/batman-adv/send.c

net/batman-adv/soft-interface.c

net/batman-adv/translation-table.c