add copy right

Signed-off-by: 072020127 <haoyuanma@gmail.com>

Author: 072020127

hack/gen_bpf_specs.go

@@ -197,7 +197,23 @@ func main() {
 	}
 
 	// template
-	tplText := `// Code generated by hack/gen_bpf_specs.go; DO NOT EDIT.
+	tplText := `/*
+ * Copyright The Kmesh Authors.
+ *
+ * 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.
+ */
+
+// Code generated by hack/gen_bpf_specs.go; DO NOT EDIT.
 
 package restart