[ upstream commit 7eb68cb0270443e8dc682ef83487ace126f3cbeb ]

When restoring endpoints from the state directory we need to also
initialize their internal "getters" as they will not be initialized on
restore.

This prevents Cilium from crashing upon initialization when a CNP with a
named port is available on the cluster.

```
goroutine 827 [running]:
github.com/cilium/cilium/pkg/endpoint.(*Endpoint).GetNamedPortLocked(0xc00024a000, 0x50?, {0xc000ba1cd0, 0x9}, 0xc0?)
 /go/src/github.com/cilium/cilium/pkg/endpoint/policy.go:68 +0x4f
github.com/cilium/cilium/pkg/policy.(*L4Filter).ToMapState(0xc001080000, {0x3434870, 0xc00024a000}, 0x1)
 /go/src/github.com/cilium/cilium/pkg/policy/l4.go:345 +0x2c3
github.com/cilium/cilium/pkg/policy.(*EndpointPolicy).computeDirectionL4PolicyMapEntries(0xc0019e8540, 0xc0019e8540?, 0xc0019e80d8?, 0x40?)
 /go/src/github.com/cilium/cilium/pkg/policy/resolve.go:171 +0xba
github.com/cilium/cilium/pkg/policy.(*EndpointPolicy).computeDesiredL4PolicyMapEntries(0xc0019e8540)
 /go/src/github.com/cilium/cilium/pkg/policy/resolve.go:164 +0x56
github.com/cilium/cilium/pkg/policy.(*selectorPolicy).DistillPolicy(0xc000d180c0, {0x3434870?, 0xc00024a000}, 0x0)
 /go/src/github.com/cilium/cilium/pkg/policy/resolve.go:141 +0x105
github.com/cilium/cilium/pkg/policy.(*cachedSelectorPolicy).Consume(0xc000123770?, {0x3434870?, 0xc00024a000?})
 /go/src/github.com/cilium/cilium/pkg/policy/distillery.go:202 +0x35
github.com/cilium/cilium/pkg/endpoint.(*Endpoint).regeneratePolicy(0xc00024a000)
 /go/src/github.com/cilium/cilium/pkg/endpoint/policy.go:234 +0x3f7
github.com/cilium/cilium/pkg/endpoint.(*Endpoint).runPreCompilationSteps(0xc00024a000, 0xc000399400)
 /go/src/github.com/cilium/cilium/pkg/endpoint/bpf.go:814 +0x2c5
github.com/cilium/cilium/pkg/endpoint.(*Endpoint).regenerateBPF(0xc00024a000, 0xc000399400)
 /go/src/github.com/cilium/cilium/pkg/endpoint/bpf.go:584 +0x189
github.com/cilium/cilium/pkg/endpoint.(*Endpoint).regenerate(0xc00024a000, 0xc000399400)
 /go/src/github.com/cilium/cilium/pkg/endpoint/policy.go:398 +0x7a5
github.com/cilium/cilium/pkg/endpoint.(*EndpointRegenerationEvent).Handle(0xc0014a2b70, 0x29fef80?)
 /go/src/github.com/cilium/cilium/pkg/endpoint/events.go:53 +0x325
```

Example of such CNP:
```
apiVersion: cilium.io/v2
kind: CiliumNetworkPolicy
metadata:
  namespace: cilium-test
  name: client-egress-to-echo-deny-named-port
spec:
  endpointSelector:
    matchLabels:
      kind: client
  egressDeny:
  - toPorts:
    - ports:
      - port: "http-8080"
        protocol: TCP
    toEndpoints:
    - matchLabels:
        io.kubernetes.pod.namespace: cilium-test
        kind: echo
```

Fixes: 6e7e9468be4b ("endpoint: Remove references to global ipcache")

Reported-by: Tam Mach <tam.mach@isovalent.com>
Signed-off-by: André Martins <andre@cilium.io>
Signed-off-by: Aditi Ghag <aditi@cilium.io>