netdev->dev_addr is const now.

Compile tested bigsur_defconfig and sb1250_swarm_defconfig.

Fixes: adeef3e3 ("net: constify netdev->dev_addr")
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>