roh/core: Add support for inetaddr notifier in roh/core

driver inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I5WKYW



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Changing the IP address will generate a network event. We register
and capture the inetaddr notifier and use the changed IP address to
configure the roh eid.

Signed-off-by: Ke Chen <chenke54@huawei.com>
Reviewed-by: Gang Zhang <gang.zhang@huawei.com>
Reviewed-by: Yefeng Yan <yanyefeng@huawei.com>
Reviewed-by: Jingchao Dai <daijingchao1@huawei.com>