Keep read/write external storage as built-in permissions

These are permissions that were mapped to gids but we need
to keep them listed event though they are no longer mapped
to gis until an upgrade from L to the current version is to
be supported. These permissions are built-in and in L were
not stored in packages.xml as a result if they are not defined
in the platform.xml while parsing packages.xml we would
ignore these permissions being granted to apps and not
propagate the granted state.

From N we are storing the built-in permissions in packages.xml
as the saved storage is negligible (one tag with the permission)
compared to the fragility as one can remove a built-in permission
which no longer needs to be mapped to gids and break grant
propagation.

bug:27185272

Change-Id: I65e05c4f7edd9a934888b4d0974100aa4e9a9453
diff --git a/data/etc/platform.xml b/data/etc/platform.xml
index d412d7c..8a7d39b 100644
--- a/data/etc/platform.xml
+++ b/data/etc/platform.xml
@@ -111,6 +111,20 @@
         <group gid="media" />
     </permission>
 
+    <!-- These are permissions that were mapped to gids but we need
+         to keep them here until an upgrade from L to the current
+         version is to be supported. These permissions are built-in
+         and in L were not stored in packages.xml as a result if they
+         are not defined here while parsing packages.xml we would
+         ignore these permissions being granted to apps and not
+         propagate the granted state. From N we are storing the
+         built-in permissions in packages.xml as the saved storage
+         is negligible (one tag with the permission) compared to
+         the fragility as one can remove a built-in permission which
+         no longer needs to be mapped to gids and break grant propagation. -->
+    <permission name="android.permission.READ_EXTERNAL_STORAGE" />
+    <permission name="android.permission.WRITE_EXTERNAL_STORAGE" />
+
     <!-- ================================================================== -->
     <!-- ================================================================== -->
     <!-- ================================================================== -->