scsi: fnic: Use eth_broadcast_addr() to assign broadcast address

Use eth_broadcast_addr() to assign broadcast address insetad of memset().

Link: https://lore.kernel.org/r/1595233498-13628-1-git-send-email-linmiaohe@huawei.com


Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>