Fix the copyright header in pom.xml to be AOSP

Back in commit a5057a257b9980e62dc47c6a4e961f773c02ca20 we modified
all headers to say "AOSP" rather than "Google", to simplify things
in the future as more contributions appear.  This file was missed.

Signed-off-by: Shawn O. Pearce <sop@google.com>
diff --git a/pom.xml b/pom.xml
index 121cacc..dfa5389 100644
--- a/pom.xml
+++ b/pom.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-Copyright 2008 Google Inc.
+Copyright (C) 2008 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.