chore: removes obsolete attribution (opendatahub-io#1109)

`raw_resources.go` originally came from kfdef plugin version, where the
code was based on [`k8utils.go`](https://github.com/opendatahub-io/opendatahub-operator/blob/700b23aa37fc88f3284eb595f7a838e6fafd59f0/pkg/utils/k8utils.go#L90) attributed to Bitnami.

Since then code has been entirely rewritten, so this license header is
not relevant anymore. This commit removes it.

pkg/feature/raw_resources.go

@@ -1,16 +1,3 @@
-/*
-Copyright (c) 2016-2017 Bitnami
-Licensed under the Apache License, Version 2.0 (the "License");
-you may not use this file except in compliance with the License.
-You may obtain a copy of the License at
-    http://www.apache.org/licenses/LICENSE-2.0
-Unless required by applicable law or agreed to in writing, software
-distributed under the License is distributed on an "AS IS" BASIS,
-WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-See the License for the specific language governing permissions and
-limitations under the License.
-*/
-
 package feature
 
 import (