Grant CAPTURE_AUDIO_OUTPUT permission for media uid

Required for AOSP WFD.

Change-Id: I72f3bab91beb8d60ff54b8b0fa19fe75cf680516

Author: luk1337

data/etc/platform.xml

@@ -165,6 +165,7 @@
     <assign-permission name="android.permission.REGISTER_STATS_PULL_ATOM" uid="media" />
     <assign-permission name="android.permission.INTERACT_ACROSS_USERS" uid="media" />
     <assign-permission name="android.permission.LOG_FOREGROUND_RESOURCE_USE" uid="media" />
+    <assign-permission name="android.permission.CAPTURE_AUDIO_OUTPUT" uid="media" />
 
     <assign-permission name="android.permission.INTERNET" uid="media" />