net: hns3: add dumping vlan filter config in debugfs

driver inclusion
category: debug
bugzilla: NA
CVE: NA

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This patch adds dumping vlan filter config in debugfs to add more DFX
method about vlan filter.

Signed-off-by: Guangbin Huang <huangguangbin2@huawei.com>
Signed-off-by: shenhao <shenhao21@huawei.com>
Reviewed-by: Zhong Zhaohui <zhongzhaohui@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>