Remove deprecated Pod Security Policies

[riccardodl]

Describe the solution you'd like

https://docs.microsoft.com/en-us/azure/aks/use-pod-security-policies
As you can see, pod security policy is getting deprecated on the 15th of October, superseded by Azure policies for AKS
https://docs.microsoft.com/en-us/azure/aks/use-pod-security-on-azure-policy
Since I use Azure policies for pods, I'd like if we update the PSP definitions with the newer definitions

Anything else you would like to add:

Environment:

• Secrets Store CSI Driver version: (use the image tag): 0.0.13
• Azure Key Vault provider version: (use the image tag): 0.0.8
• Kubernetes version: (use kubectl version): 1.18.6
• Cluster type: (e.g. AKS, aks-engine, etc): AKS

[ekhaydarov]

How do you even enable pod security policies in deployment/pod-security-policy.yaml. setting rbac.enable: true still gives an error of Host network is not allowed to be used and Host port 9808 is not allowed to be used. There is nothing else in values.yaml that covers enabling pod security policies

Looking at this PR it seems there is not flag in helm charts to let you just enable pod security policy in a values yaml file. You still have to manually apply them yourself.

Would it not be easier for everyone if it was part of the helm chart and optionally enabled?

[aramase]

Closing in favor of #787