chore: fix eks e2e

After the recenet change around the subnets the e2e where breaking as
it wasn't using the new resource id field.

Signed-off-by: Richard Case <richard.case@outlook.com>

pkg/cloud/services/eks/cluster.go

@@ -278,7 +278,8 @@ func makeVpcConfig(subnets infrav1.Subnets, endpointAccess ekscontrolplanev1.End
 	subnetIds := make([]*string, 0)
 	for i := range subnets {
 		subnet := subnets[i]
-		subnetIds = append(subnetIds, &subnet.ResourceID)
+		subnetID := subnet.GetResourceID()
+		subnetIds = append(subnetIds, &subnetID)
 	}
 
 	cidrs := make([]*string, 0)