Changed var.eks_service_role_arn description and updated main.tf to u…

…se it instead of the originally proposed map.

iam.tf

@@ -12,7 +12,7 @@ data "aws_iam_policy_document" "assume_role" {
   }
 }
 locals {
-  eks_service_role = var.eks_cluster_service_role != null ? var.eks_cluster_service_role : aws_iam_role.default
+  eks_service_role = var.eks_cluster_service_role_arn != null ? var.eks_cluster_service_role_arn : aws_iam_role.default.arn
 }
 resource "aws_iam_role" "default" {
   count              = var.eks_cluster_service_role != null && local.enabled ? 1 : 0

variables.tf

@@ -33,7 +33,7 @@ variable "workers_role_arns" {
 
 variable "eks_cluster_service_role_arn" {
   type        = string
-  description = "The entire output map of aws_iam_role for the eks service role, or leave blank to create one"
+  description = "The arn of an externally created eks service role to use, or leave blank to create one"
   default     = null
 }