Remove stale comment and add copyright notice

The service-statsd blueprint had some stale TODO's in it.

Bug: 146757305
Test: m
Change-Id: Iebd4409f95b7ea1f950df6c615dce09c8852f076

apex/statsd/service/Android.bp

@@ -1,6 +1,16 @@
-// Statsd Service jar, which will eventually be put in the statsd mainline apex.
-// service-statsd needs to be added to PRODUCT_UPDATABLE_SYSTEM_SERVER_JARS.
-// This jar will contain StatsCompanionService
+// Copyright (C) 2020 The Android Open Source Project
+//
+// 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.
 
 filegroup {
     name: "service-statsd-sources",