Move backup encryption to separate APK

Test: atest -c --rebuild-module-info BackupEncryptionRoboTests
Change-Id: I5a8ac3a9c010bd3c516464dee333cef406c5dcfa
diff --git a/packages/BackupEncryption/Android.bp b/packages/BackupEncryption/Android.bp
new file mode 100644
index 0000000..50dbcdb
--- /dev/null
+++ b/packages/BackupEncryption/Android.bp
@@ -0,0 +1,24 @@
+//
+// Copyright (C) 2019 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.
+//
+
+android_app {
+    name: "BackupEncryption",
+    srcs: ["src/**/*.java"],
+    optimize: { enabled: false },
+    platform_apis: true,
+    certificate: "platform",
+    privileged: true,
+}
\ No newline at end of file