Fix NAT loopback with CTF enabled (AC56/AC68)
Enable low RSSI handling on AC56/AC68 targets
rc: Fixed incorrect parameter being passed
Bumped revision to 374.35-alpha4
rc: Fix const correctness.
dhcpv6: Request a /56 IA_PD prefix
dhcpv6: Make sla-len config optional
dhcpv6: Make sla-id config optional
dhcpv6: Don't set sla-len
dhcpv6: pass IA_PD prefix to dhcpv6 state script
rc: Use ipv6 address assigned to lan interface to calculate prefix

This way radvd will advertise the correct prefix subnet for the
lan interface.
rc: Set ipv6 prefix from value passed by dhcp6c