Update ebs-csi-driver.md

[ali-parsfar]

IRSA Role Added

What this PR does / why we need it:

Which issue(s) this PR fixes:

Fixes #

Quality checks

• [ ] My content adheres to the style guidelines
• [ ] I ran make test module="<module>" it was successful (see https://github.com/aws-samples/eks-workshop-v2/blob/main/docs/automated_tests.md)

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[niallthomson]

Hi @ali-parsfar can I have more context of the nature of this change? Currently we create the IAM role for the add-on in Terraform

https://github.com/aws-samples/eks-workshop-v2/blob/main/manifests/modules/fundamentals/storage/ebs/.workshop/terraform/main.tf

This is a standard pattern in these labs.