ipam: do not assign v4 addresses for status.IPV6
ipam: do not assign v4 addresses for status.IPV6

Spotted by inspection. status.IPV6 should only hold v6 addresses
that we prepped earlier. Only the allocv4 is merged and holds both
but not v4.

Fixes: b2ff83adff68 ("ipam: Provide ownership information of IP allocations")
Signed-off-by: Daniel Borkmann <3d0f3b9ddcacec30c4008c5e030e6c13a478cb4f@iogearbox.net>

cilium/cilium,michi-covalent/cilium,tklauser/cilium,tgraf/cilium,tklauser/cilium,tgraf/cilium,tklauser/cilium,michi-covalent/cilium,cilium-team/cilium,tklauser/cilium,michi-covalent/cilium,cilium/cilium,cilium/cilium,cilium/cilium,tklauser/cilium,tgraf/cilium,michi-covalent/cilium,tgraf/cilium,cilium-team/cilium,tgraf/cilium,tgraf/cilium,michi-covalent/cilium,cilium/cilium