rbd: remove kp-metadata register functions of HPCS/Key Protect

This commit removes `kp-metadata` registration from existing HPCS
or Key Protect code as per the plan.

Fix #2816

Signed-off-by: Humble Chirammal <hchiramm@redhat.com>

internal/kms/keyprotect.go

@@ -23,7 +23,6 @@ import (
 	"fmt"
 
 	"github.com/ceph/ceph-csi/internal/util/k8s"
-	"github.com/ceph/ceph-csi/internal/util/log"
 
 	kp "github.com/IBM/keyprotect-go-client"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
@@ -31,7 +30,6 @@ import (
 
 const (
 	kmsTypeKeyProtectMetadata = "ibmkeyprotect"
-	kmsTypeKeyProtectMetadataOld = "kp-metadata"
 	// keyProtectMetadataDefaultSecretsName is the default name of the Kubernetes Secret
 	// that contains the credentials to access the Key Protect KMS. The name of
 	// the Secret can be configured by setting the `IBM_KP_SECRET_NAME`
@@ -63,21 +61,6 @@ var _ = RegisterProvider(Provider{
 	Initializer: initKeyProtectKMS,
 })
 
-// RegisterProvider for kmsTypeKeyProtectMetadataOld is kept here for backward compatibility.
-var _ = RegisterProvider(Provider{
-	UniqueID:    kmsTypeKeyProtectMetadataOld,
-	Initializer: initKeyProtectKMSOld,
-})
-
-// initKeyProtectKMSOld is the wrapper with a warning log.
-func initKeyProtectKMSOld(args ProviderInitArgs) (EncryptionKMS, error) {
-	log.WarningLogMsg("%q is deprecated provider for IBM key Protect,"+
-		"use new provider name %q in the configuration, proceeding with %q",
-		kmsTypeKeyProtectMetadataOld, kmsTypeKeyProtectMetadata, kmsTypeKeyProtectMetadata)
-
-	return initKeyProtectKMS(args)
-}
-
 // KeyProtectKMS store the KMS connection information retrieved from the kms configmap.
 type keyProtectKMS struct {
 	// basic options to get the secret