net: hns3: support set/get VxLAN rule of rx flow director by ethtool

driver inclusion
category:feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I61CGU



----------------------------------------------------------------------

This patch adds support rule type of vxlan4 and vxlan6 for rx flow
director by command ethtool -u/-U.

Signed-off-by: Guangbin Huang <huangguangbin2@huawei.com>
Signed-off-by: Jiantao Xiao <xiaojiantao1@h-partners.com>