Adding android.permission.MANAGE_VOICE_KEYPHRASES to the shell app to allow GTS tests to pass.

Change-Id: I40c41f8023234091260650a14d631f8900057849
Bug: 203585818
diff --git a/packages/Shell/AndroidManifest.xml b/packages/Shell/AndroidManifest.xml
index 7d06620..41193e6a 100644
--- a/packages/Shell/AndroidManifest.xml
+++ b/packages/Shell/AndroidManifest.xml
@@ -583,6 +583,9 @@
     <uses-permission android:name="android.permission.MANAGE_VIRTUAL_MACHINE" />
     <uses-permission android:name="android.permission.DEBUG_VIRTUAL_MACHINE" />
 
+    <!-- Permission required to run GtsAssistantTestCases -->
+    <uses-permission android:name="android.permission.MANAGE_VOICE_KEYPHRASES" />
+
     <application android:label="@string/app_label"
                 android:theme="@android:style/Theme.DeviceDefault.DayNight"
                 android:defaultToDeviceProtectedStorage="true"