hsr: Use ether_addr_copy

It's slightly smaller/faster for some architectures.
Make sure def_multicast_addr is __aligned(2)

Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --cc net/hsr/hsr_device.c
Simple merge

diff --cc net/hsr/hsr_framereg.c
Simple merge

diff --cc net/hsr/hsr_main.c
Simple merge