pkg/maps: fix interface implementation for SourceRangeKey{4,6}
pkg/maps: fix interface implementation for SourceRangeKey{4,6}

The interface SourceRangeKey should implement the ToNetwork() and
ToHost() methods by returning a SourceRangeKey and not a pointer for the
implementation structure.

Fixes: 945a852cfe62 ("lbmap: Add SourceRange maps")
Fixes: 682f6826bce7 ("lbmap: Optimize lbmap byte order related code")
Signed-off-by: André Martins <bc9800b9d52a24cce72a73dd528afed53f10e5fc@cilium.io>

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