[FS#322] LAN doesn't get the ipv6 address when WAN6 uses DHCPv6

[LEDE Bugs]

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FS#322 - LAN doesn't get the ipv6 address when WAN6 uses DHCPv6
User who did this - hzdrro (hzdrro)

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I don't think I need to get a IPv6 prefix, my computer can get a IPv6 address by setting "Interfaces - LAN"-"DHCP Server"-"DHCP Server" to "relay mode" on OpenWrt CC.
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https://bugs.lede-project.org/index.php?do=details&task_id=322#comment1002