fix: parse addr use wrong function

[ehloo]

What this PR does / why we need it:

➡️ I want set macPrefix but got error:

> {"level":"ERROR","ts":"2023-08-31T17:06:07.128+0800","caller":"networking/mac.go:52","msg":"failed to ParsePrefix","Action":"Add","ContainerID":"740978ee3c4f8de88d35f44eee0b5ef5aa5333d95531697eaae84984e4ad537b","PodUID":"885ef2ab-132e-4241-8e2e-f290c7192bae","PodName":"sre-demo-769965497c-xqtlp","PodNamespace":"default","IfName":"eth0","error":"netip.ParsePrefix("10.246.132.202"): no '/'"}

➡️ My net-attach-def:

{
        "cniVersion": "0.3.1",
        "name": "macvlan-conf",
        "plugins": [
            {
                "type": "macvlan",
                "master": "br0",
                "mode": "bridge",
                "ipam": {
                    "type": "spiderpool"
                }
            },{
                  "type": "veth",
                  "cluster_cidr": ["172.16.0.0/12"],
                  "service_cidr": ["172.10.0.0/16"],
                  "hardware_prefix": "06:08"
              }
        ]
    }

➡️ Coordinator plugin is right：
https://github.com/spidernet-io/spiderpool/blob/main/pkg/networking/networking/mac.go

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer: