pkg/option: set option used for k8s endpoint field selector
pkg/option: set option used for k8s endpoint field selector

Fixes: ada4e28df2ab ("k8s: set endpoint watcher selector as a CLI option")
Signed-off-by: André Martins <bc9800b9d52a24cce72a73dd528afed53f10e5fc@cilium.io>

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