net: hns3: delete some useless function and definication

driver inclusion
category: bugfix
bugzilla: NA
CVE: NA

Hns3 had refine mac address configure for VF, and function
hns3_remove_hw_addr was useless.

This patch also delete some useless definication in set vf mac addr.

Fixes: 74500eb0024 ("net: hns3: refine mac address configure for VF")

Signed-off-by: Guojia Liao <liaoguojia@huawei.com>
Reviewed-by: Peng Li <lipeng321@huawei.com>
Reviewed-by: Zhong Zhaohui <zhongzhaohui@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>