Don't grant 'android.permission.READ_EXTERNAL_STORAGE' by default

needs to be removed to fix gts

Test: run gts-dev -m GtsPermissionTestCases --test com.google.android.permission.gts.DefaultPermissionGrantPolicyTest#testDefaultGrantsWithRemoteExceptions

Change-Id: Ia23e3c5f8405685d1fbb0fe613b5e2ced7234375
diff --git a/default_permissions_com.android.wallpaper.xml b/default_permissions_com.android.wallpaper.xml
index 41b23ce..7a497a1 100644
--- a/default_permissions_com.android.wallpaper.xml
+++ b/default_permissions_com.android.wallpaper.xml
@@ -30,8 +30,10 @@
     approval. Typically these are to ensure either legally mandated functions
     or the app is considered a part of the OS.
 -->
+<!--
 <exceptions>
     <exception package="com.android.wallpaper">
         <permission name="android.permission.READ_EXTERNAL_STORAGE" fixed="false"/>
     </exception>
 </exceptions>
+-->