net/mlxbf_gige: use eth_zero_addr() to clear mac address

Use eth_zero_addr() to clear mac address instead of memset().

Signed-off-by: Lu Wei <luwei32@huawei.com>
Link: https://lore.kernel.org/r/20220516033343.329178-1-luwei32@huawei.com


Signed-off-by: Paolo Abeni <pabeni@redhat.com>