wifi: plfxlc: Use eth_zero_addr() to assign zero address

Using eth_zero_addr() to assign zero address instead of memset().

Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Xu Qiang <xuqiang36@huawei.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/20220701082935.110924-1-xuqiang36@huawei.com