tipc: move bcast_addr from struct tipc_media to struct tipc_bearer

Some network protocols, like InfiniBand, don't have a fixed broadcast
address but one that depends on the configuration. Move the bcast_addr
to struct tipc_bearer and initialize it with the broadcast address of
the network device when the bearer is enabled.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --cc net/tipc/bcast.c
Simple merge

diff --cc net/tipc/bearer.c
Simple merge

diff --cc net/tipc/bearer.h
Simple merge

diff --cc net/tipc/discover.c
Simple merge

diff --cc net/tipc/eth_media.c
Simple merge