android: add basic support for google game dashboard

src/android/app/src/main/AndroidManifest.xml

@@ -31,6 +31,9 @@ SPDX-License-Identifier: GPL-3.0-or-later
         android:dataExtractionRules="@xml/data_extraction_rules_api_31"
         android:enableOnBackInvokedCallback="true">
 
+        <meta-data android:name="android.game_mode_config"
+            android:resource="@xml/game_mode_config" />
+
         <activity
             android:name="org.yuzu.yuzu_emu.ui.main.MainActivity"
             android:exported="true"

src/android/app/src/main/res/xml/game_mode_config.xml

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<game-mode-config
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:supportsBatteryGameMode="true"
+    android:supportsPerformanceGameMode="true"
+    android:allowGameDownscaling="false"
+    android:allowGameFpsOverride="false"/>