Set empty string for awsServiceKeyName. Error for IRSA users because OpenCost was expecting a ServiceKey. (#1966)

Signed-off-by: thomasvn <thomasnguyen96@gmail.com>

configs/aws.json

@@ -12,11 +12,11 @@
     "internetNetworkEgress": "0.143",
     "spotLabel": "kops.k8s.io/instancegroup",
     "spotLabelValue": "spotinstance-nodes",
-    "awsServiceKeyName": "AKIXXX",
+    "awsServiceKeyName": "",
     "awsServiceKeySecret": "",
     "awsSpotDataRegion":"us-east-2",
     "awsSpotDataBucket": "x",
-    "awsSpotDataPrefix": "spotdata",
+    "awsSpotDataPrefix": "",
     "athenaBucketName": "s3://x",
     "athenaRegion": "us-east-1",
     "athenaDatabase": "",