webhook: Remove klog.InitFlags(nil)

to avoid panic:
```
panic: /tmp/go-build1586768671/b001/exe/webhook flag redefined: alsologtostderr

goroutine 1 [running]:
flag.(*FlagSet).Var(0xc0000781c0, {0x3daf2d0, 0x5566969}, {0x394a710, 0xf}, {0x39e87ee, 0x49})
        /usr/lib/golang/src/flag/flag.go:1029 +0x3b9
k8s.io/klog/v2.InitFlags.func1(0xc000234990?)
        /home/apanatto/go/pkg/mod/k8s.io/klog/[email protected]/klog.go:447 +0x31
flag.(*FlagSet).VisitAll(0xc0003f4c40?, 0xc000785de0)
        /usr/lib/golang/src/flag/flag.go:458 +0x42
k8s.io/klog/v2.InitFlags(0x3dc1aa0?)
        /home/apanatto/go/pkg/mod/k8s.io/klog/[email protected]/klog.go:446 +0x3c
main.init.0()
        /home/apanatto/dev/github.com/k8snetworkplumbingwg/sriov-network-operator/cmd/webhook/main.go:27 +0x15
exit status 2
```

Signed-off-by: Andrea Panattoni <[email protected]>

Author: zeeke

cmd/webhook/main.go

@@ -5,7 +5,6 @@ import (
 	"os"
 
 	"github.com/spf13/cobra"
-	"k8s.io/klog/v2"
 	"sigs.k8s.io/controller-runtime/pkg/log"
 
 	snolog "github.com/k8snetworkplumbingwg/sriov-network-operator/pkg/log"
@@ -24,7 +23,6 @@ var (
 )
 
 func init() {
-	klog.InitFlags(nil)
 	snolog.BindFlags(flag.CommandLine)
 	rootCmd.PersistentFlags().AddGoFlagSet(flag.CommandLine)
 }