[EKS] [aws-efs-csi-driver]: `replicationCount` configuration is outside of schema properties block making it unconfigurable

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**Tell us about your request**
What do you want us to build?

Please fix the eks addon configuration schema for `aws-efs-csi-driver`, it is failing even at the latest version of `v2.0.5-eksbuild.1`

```sh
$ aws eks describe-addon-configuration \
--addon-name aws-efs-csi-driver \
--addon-version v2.0.5-eksbuild.1 \
--query 'configurationSchema' \
--output text \
| jq .
{
"$schema": "https://json-schema.org/draft/2019-09/schema",
"additionalProperties": false,
"description": "Configurable parameters for the aws-efs-csi-driver",
"properties": {
// ...
"node": {
"additionalProperties": false,
"properties": {
// ...
},
"replicaCount": {
"description": "The number of replicas for the CSI controller service Deployment",
"type": "integer"
},
"type": "object"
},
// ...
},
"type": "object"
}
```

`replicaCount` is outside of the `properties` block, making it unconfigurable

ref: https://github.com/kubernetes-sigs/aws-efs-csi-driver/issues/1181#issuecomment-2223026567

**Which service(s) is this request for?**
EKS addons - `aws-efs-csi-driver`

Start with the AWS CLI command in the issue and inspect the returned configurationSchema for aws-efs-csi-driver v2.0.5-eksbuild.1, then read the referenced aws-efs-csi-driver issue. Done means replicaCount is placed within the node properties schema and can be configured successfully.

Written by the indexing model from the issue text.