[IBM][4.12][Snapshot] restore size in snapshot is not the same size of pvc request size

Description of problem:

Restore size in snapshot output is not the same size of pvc request size 

Version-Release number of selected component (if applicable):

How reproducible:

Always

Steps to Reproduce:

1. Create IBM cluster. 
    Flexy template: aos-4_12/ipi-on-ibmcloud/versioned-installer-  
                    private_cluster-ovn-fips-ci
    Payload: 4.12.0-0.nightly-2022-11-29-131548 
2. Create sc, pvc, dep
3. Create volumesnapshot from default volumesnapshotclass. 
4. Check the volumesnapshot output restore size 

sc_pvc_dep.yaml
apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:
name: mysc
parameters:
profile: 10iops-tier
provisioner: vpc.block.csi.ibm.io
reclaimPolicy: Delete
volumeBindingMode: WaitForFirstConsumer
—
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
name: mypvc-csi
namespace: testropatil
spec:
accessModes:

• ReadWriteOnce
  resources:
  requests:
  storage: 26Gi
  storageClassName: mysc
  volumeMode: Filesystem
  —
  apiVersion: apps/v1
  kind: Deployment
  metadata:
  name: mydep
  namespace: testropatil
  spec:
  replicas: 1
  selector:
  matchLabels:
  app: myapp-54mtso67
  template:
  metadata:
  labels:
  app: myapp-54mtso67
  spec:
  containers:
• image: quay.io/openshifttest/hello-openshift@sha256:56c354e7885051b6bb4263f9faa58b2c292d44790599b7dde0e49e7c466cf339
  name: mydep
  ports:
• containerPort: 80
  volumeMounts:
• mountPath: "/mnt/storage"
  name: local
  volumes:
• name: local
  persistentVolumeClaim:
  claimName: mypvc-csi
   
  vss.yaml
  apiVersion: snapshot.storage.k8s.io/v1
  kind: VolumeSnapshot
  metadata:
  name: my-snapshot-new
  namespace: testropatil
  spec:
  source:
  persistentVolumeClaimName: mypvc-csi
  volumeSnapshotClassName: vpc-block-snapshot

  rohitpatil@ropatil-mac Downloads % oc get sc                           NAME                                   PROVISIONER            RECLAIMPOLICY   VOLUMEBINDINGMODE      ALLOWVOLUMEEXPANSION   AGEmysc                                   vpc.block.csi.ibm.io   Delete          WaitForFirstConsumer   true                   2m37s

  rohitpatil@ropatil-mac Downloads % oc get pvc,pod -n testropatilNAME                              STATUS   VOLUME                                     CAPACITY   ACCESS MODES   STORAGECLASS   AGEpersistentvolumeclaim/mypvc-csi   Bound    pvc-1a014601-8176-4c55-93cf-d408460b9359   26Gi       RWO            mysc           27s
  NAME                         READY   STATUS    RESTARTS   AGEpod/mydep-5477fd946b-w77sw   1/1     Running   0          27s 

  rohitpatil@ropatil-mac Downloads % oc get volumesnapshot -n testropatilNAME              READYTOUSE   SOURCEPVC   SOURCESNAPSHOTCONTENT   RESTORESIZE   SNAPSHOTCLASS        SNAPSHOTCONTENT                                    CREATIONTIME   AGEmy-snapshot-new   true         mypvc-csi                           1Gi           vpc-block-snapshot   snapcontent-a40f3a17-8697-4215-8a2f-77d3d5592c60   29s            32s 

  Actual results:

  volumesnapshot RESTORESIZE is 1Gi which is not the same to pvc request size(26Gi)

  Expected results:

  volumesnapshot should be the same size of pvc request size

  Additional info: