Add FEATURE_GAMEPAD.

This allows micro-consoles or other devices to signify that there's a
game controller in the box, even if the user hasn't connected it.

Change-Id: I93cfba8bd1376aa5d1ec772a5b643b974eaa36c5

data/etc/android.hardware.gamepad.xml

@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (C) 2014 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.
+-->
+
+<!-- This is the standard feature indicating that the device is a compatible gamepad or includes
+     one in the box. -->
+<permissions>
+    <feature name="android.hardware.gamepad" />
+</permissions>
+