[dhcpv6_relay] Fix dependency of dhcp-mon on VLAN with only v6 cfg is provided#13006

kellyyeh merged 1 commit intosonic-net:mastersonic-net/sonic-buildimage:masterfrom

vivekrnv:v6_only_cfg_dhcpvivekrnv/sonic-buildimage:v6_only_cfg_dhcpCopy head branch name to clipboard