remove gateway completely (#15929)

helm/minio/values.yaml

@@ -28,8 +28,8 @@ mcImage:
   tag: RELEASE.2022-10-20T23-26-33Z
   pullPolicy: IfNotPresent
 
-## minio mode, i.e. standalone or distributed or gateway.
-mode: distributed ## other supported values are "standalone", "gateway"
+## minio mode, i.e. standalone or distributed
+mode: distributed ## other supported values are "standalone"
 
 ## Additional labels to include with deployment or statefulset
 additionalLabels: {}
@@ -118,11 +118,6 @@ replicas: 16
 # Number of expanded MinIO clusters
 pools: 1
 
-# Deploy if 'mode == gateway' - 4 replicas.
-gateway:
-  type: "nas" # currently only "nas" are supported.
-  replicas: 4
-
 ## TLS Settings for MinIO
 tls:
   enabled: false