Remove unused AndroidManifest.xml file for datastore-preferences-core

This is a java library and it does not use manifests

Change-Id: I4ae168a35543d8bb48dc45fb6cdd0d7e9188c452
diff --git a/datastore/datastore-preferences-core/datastore-preferences-proto/src/main/AndroidManifest.xml b/datastore/datastore-preferences-core/datastore-preferences-proto/src/main/AndroidManifest.xml
deleted file mode 100644
index 384c619..0000000
--- a/datastore/datastore-preferences-core/datastore-preferences-proto/src/main/AndroidManifest.xml
+++ /dev/null
@@ -1,20 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<!--
-  Copyright 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.
-  -->
-<manifest xmlns:android="http://schemas.android.com/apk/res/android"
-    package="androidx.datastore.preferences.proto">
-
-</manifest>
\ No newline at end of file