Merge pull request #52644 from surajnarwade/remove_unused_var_const

Automatic merge from submit-queue. If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.

Remove unused variables and constant from pkg/apis/componentconfig/v1…

…alpha1/defaults.go

This commit will remove variables `zeroDuration`, `defaultNodeAllocatableEnforcement` and
constants `defaultIPTablesMasqueradeBit` and `defaultIPTablesDropBit` as they are unused.



```release-note
NONE
```

pkg/apis/componentconfig/v1alpha1/defaults.go

@@ -29,21 +29,6 @@ import (
 	"k8s.io/kubernetes/pkg/master/ports"
 )
 
-const (
-	DefaultRootDir = "/var/lib/kubelet"
-
-	AutoDetectCloudProvider = "auto-detect"
-
-	defaultIPTablesMasqueradeBit = 14
-	defaultIPTablesDropBit       = 15
-)
-
-var (
-	zeroDuration = metav1.Duration{}
-	// Refer to [Node Allocatable](https://git.k8s.io/community/contributors/design-proposals/node-allocatable.md) doc for more information.
-	defaultNodeAllocatableEnforcement = []string{"pods"}
-)
-
 func addDefaultingFuncs(scheme *kruntime.Scheme) error {
 	return RegisterDefaults(scheme)
 }