sepolicy: give otapreopt getattr

Allow the otapreopt rename script to read file attributes. This is
being used to print the aggregate artifact size for diagnostic

Bug: 30832951
Change-Id: Iee410adf59dcbb74fa4b49edb27d028025cd8bf9
diff --git a/otapreopt_slot.te b/otapreopt_slot.te
index b68b399..2f4da0a 100644
--- a/otapreopt_slot.te
+++ b/otapreopt_slot.te
@@ -11,8 +11,9 @@
 # The otapreopt_slot renames the OTA dalvik-cache to the regular dalvik-cache, and cleans up
-# the directory afterwards.
+# the directory afterwards. For logging of aggregate size, we need getattr.
 allow otapreopt_slot ota_data_file:dir { rw_dir_perms rename reparent rmdir };
+allow otapreopt_slot ota_data_file:file { getattr };
 # Delete old content of the dalvik-cache.
 allow otapreopt_slot dalvikcache_data_file:dir { add_name getattr open read remove_name rmdir search write };