staging: rtl8723bs: core: use eth_broadcast_addr() to assign broadcast address

Using eth_broadcast_addr() to assign broadcast address instead
of copying from an array that contains the all-ones broadcast
address.

Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Link: https://lore.kernel.org/r/20210616081243.2511663-3-yangyingliang@huawei.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>