Description of problem:
azure-disk-csi-driver-operator should allow more nodes to be updated simultaneously for speeding up cluster upgrade


Version-Release number of selected component (if applicable):
4.8.0-0.nightly-2021-04-08-200632

How reproducible:
Always

Steps to Reproduce:
1. Set Up an OCP4.8 cluster on Azure
2. Enable TechPreviewNoUpgrade featureset
3. Check azure-disk-csi-driver-node daemonset

Actual results:
$ oc -n openshift-cluster-csi-drivers  get ds azure-disk-csi-driver-node -ojson|jq .spec.updateStrategy
{
  "rollingUpdate": {
    "maxSurge": 0,
    "maxUnavailable": 1
  },
  "type": "RollingUpdate"
}

With this update strategy, only one node can be updated at the same time.

Expected results:
For other csi drivers, such as aws ebs csi driver, the update strategy is:
updateStrategy:
  type: RollingUpdate
  rollingUpdate:
    maxUnavailable: 10%