Merge pull request #81538 from brendan-daly-red-hat/OCPBUGS-37687_2

OCPBUGS-37687_2#adding optional iam role permissions

Author: skopacz1

modules/installation-aws-permissions.adoc

@@ -154,7 +154,9 @@ If you use an existing Virtual Private Cloud (VPC), your account does not requir
 
 [NOTE]
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-If you have not created a load balancer in your AWS account, the IAM user also requires the `iam:CreateServiceLinkedRole` permission.
+* If you specify an existing IAM role in the `install-config.yaml` file, the following IAM permissions are not required: `iam:CreateRole`,`iam:DeleteRole`, `iam:DeleteRolePolicy`, and `iam:PutRolePolicy`.
+
+* If you have not created a load balancer in your AWS account, the IAM user also requires the `iam:CreateServiceLinkedRole` permission.
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