[attestation] Rename test_apk to demo_apk for Vm attestation

A separate test_apk will be added in a subsequent cl for e2e test.

Specifically, the demo_apk calls the real request attestation API
and interacts with RKPD to retrieve the real remotely provisioned
keys; while the test_apk will call the request attestation API
for testing only and will not trigger RKPD, a mock key will be used
in this case.

Test: Run VmAttestationDemoApp manually
Change-Id: I5e02dc071d167156e98088829227e83300899461
diff --git a/service_vm/demo_apk/AndroidManifest.xml b/service_vm/demo_apk/AndroidManifest.xml
new file mode 100644
index 0000000..228195d
--- /dev/null
+++ b/service_vm/demo_apk/AndroidManifest.xml
@@ -0,0 +1,21 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (C) 2023 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="com.android.virt.vm_attestation.demo">
+     <uses-permission android:name="android.permission.MANAGE_VIRTUAL_MACHINE" />
+     <uses-permission android:name="android.permission.USE_CUSTOM_VIRTUAL_MACHINE" />
+
+     <application android:hasCode="false"/>
+</manifest>