Description of problem:
Can't take a snapshot for a pre provisioned volumesnapshotcontent instance

Version-Release number of selected component (if applicable):
4.7.0-0.nightly-2020-12-17-201522

How reproducible:
Always

Steps to Reproduce:
1. Create a volumesnapshotcontent object with:
$ cat vsc-manual.yaml 
apiVersion: snapshot.storage.k8s.io/v1
kind: VolumeSnapshotContent
metadata:
  name: test-2
spec:
  deletionPolicy: Retain
  driver: ebs.csi.aws.com
  source:
    volumeHandle: vol-0613e88470c9a9b9d
  volumeSnapshotClassName: csi-snapshotclass
  volumeSnapshotRef:
    apiVersion: snapshot.storage.k8s.io/v1beta1
    kind: VolumeSnapshot
    name: mysnapshot-v2
    namespace: piqin
2. Create a volumesnapshot object with:
$ cat ss-manual.yaml 
apiVersion: snapshot.storage.k8s.io/v1
kind: VolumeSnapshot
metadata:
  name: mysnapshot-v2
spec:
  volumeSnapshotClassName: csi-snapshotclass
  source:
    volumeSnapshotContentName: test-2


Actual results:
$ oc get volumesnapshot
NAME            READYTOUSE   SOURCEPVC    SOURCESNAPSHOTCONTENT   RESTORESIZE   SNAPSHOTCLASS       SNAPSHOTCONTENT                                    CREATIONTIME   AGE
mysnapshot-v2   false                     test-2                                csi-snapshotclass                                                                     12m

$ oc get volumesnapshotcontent test-2
NAME     READYTOUSE   RESTORESIZE   DELETIONPOLICY   DRIVER            VOLUMESNAPSHOTCLASS   VOLUMESNAPSHOT   AGE
test-2   false                      Retain           ebs.csi.aws.com   csi-snapshotclass     mysnapshot-v2    14m

volumesnapshotcontent/test-2 is not ready to use for a long time.

Get some events:
Warning  SnapshotCreationFailed               12m   csi-snapshotter ebs.csi.aws.com  Failed to create snapshot: failed to take snapshot of the volume, vol-0613e88470c9a9b9d: "cannot create snapshot. Snapshot content test-2 not bound to a snapshot"
  Warning  SnapshotContentCheckandUpdateFailed  12m   csi-snapshotter ebs.csi.aws.com  Failed to check and update snapshot content: failed to take snapshot of the volume, vol-0613e88470c9a9b9d: "cannot create snapshot. Snapshot content test-2 not bound to a snapshot"


Expected results:
After the volumesnapshot/mysnapshot-v2 is created the volumesnapshotcontent/test-2 should be in boud status, and snapshot should be taken for the volume defined in the volumesnapshotcontent/test-2.

Additional info:
logs get from csi driver:
E1218 08:35:54.102915       1 snapshot_controller_base.go:261] could not sync content "test-2": failed to take snapshot of the volume, vol-0613e88470c9a9b9d: "cannot create snapshot. Snapshot content test-2 not bound to a snapshot"
E1218 08:36:01.743382       1 snapshot_controller.go:122] checkandUpdateContentStatus [test-2]: error occurred failed to take snapshot of the volume, vol-0613e88470c9a9b9d: "cannot create snapshot. Snapshot content test-2 not bound to a snapshot"
E1218 08:36:01.743391       1 snapshot_controller_base.go:261] could not sync content "test-2": failed to take snapshot of the volume, vol-0613e88470c9a9b9d: "cannot create snapshot. Snapshot content test-2 not bound to a snapshot"
E1218 08:36:54.103018       1 snapshot_controller.go:122] checkandUpdateContentStatus [test-2]: error occurred failed to take snapshot of the volume, vol-0613e88470c9a9b9d: "cannot create snapshot. Snapshot content test-2 not bound to a snapshot"
E1218 08:36:54.103027       1 snapshot_controller_base.go:261] could not sync content "test-2": failed to take snapshot of the volume, vol-0613e88470c9a9b9d: "cannot create snapshot. Snapshot content test-2 not bound to a snapshot"
E1218 08:37:54.103049       1 snapshot_controller.go:122] checkandUpdateContentStatus [test-2]: error occurred failed to take snapshot of the volume, vol-0613e88470c9a9b9d: "cannot create snapshot. Snapshot content test-2 not bound to a snapshot"
E1218 08:37:54.103059       1 snapshot_controller_base.go:261] could not sync content "test-2": failed to take snapshot of the volume, vol-0613e88470c9a9b9d: "cannot create snapshot. Snapshot content test-2 not bound to a snapshot"
E1218 08:38:54.103112       1 snapshot_controller.go:122] checkandUpdateContentStatus [test-2]: error occurred failed to take snapshot of the volume, vol-0613e88470c9a9b9d: "cannot create snapshot. Snapshot content test-2 not bound to a snapshot"
E1218 08:38:54.103120       1 snapshot_controller_base.go:261] could not sync content "test-2": failed to take snapshot of the volume, vol-0613e88470c9a9b9d: "cannot create snapshot. Snapshot content test-2 not bound to a snapshot"
E1218 08:39:54.103199       1 snapshot_controller.go:122] checkandUpdateContentStatus [test-2]: error occurred failed to take snapshot of the volume, vol-0613e88470c9a9b9d: "cannot create snapshot. Snapshot content test-2 not bound to a snapshot"
E1218 08:39:54.103209       1 snapshot_controller_base.go:261] could not sync content "test-2": failed to take snapshot of the volume, vol-0613e88470c9a9b9d: "cannot create snapshot. Snapshot content test-2 not bound to a snapshot"
E1218 08:40:54.103320       1 snapshot_controller.go:122] checkandUpdateContentStatus [test-2]: error occurred failed to take snapshot of the volume, vol-0613e88470c9a9b9d: "cannot create snapshot. Snapshot content test-2 not bound to a snapshot"
E1218 08:40:54.103328       1 snapshot_controller_base.go:261] could not sync content "test-2": failed to take snapshot of the volume, vol-0613e88470c9a9b9d: "cannot create snapshot. Snapshot content test-2 not bound to a snapshot"