Add read permission to storage_area_keys to installd

Installd needs the read permission on storage area
key directories. This only comes up in testing when the tests
are rerun on the same device.

Bug: 325129836
Test: atest StorageAreaTest
Change-Id: I74c776c52d66492552aaf8b61c7591fb19194f7a
diff --git a/private/installd.te b/private/installd.te
index af0d62c..640d440 100644
--- a/private/installd.te
+++ b/private/installd.te
@@ -227,7 +227,7 @@
 
 # on app uninstall, installd deletes the storage area keys for the app
 is_flag_enabled(RELEASE_UNLOCKED_STORAGE_API, `
-  allow installd storage_area_key_file:dir { open search write remove_name lock };
+  allow installd storage_area_key_file:dir { open search write remove_name lock read };
   allow installd storage_area_key_file:file unlink;
 ')