Add metadata_file class for root of metadata folder.

Bug: 77335096
Test: booted device with metadata encryption and without
Change-Id: I5bc5d46deb4e91912725c4887fde0c3a41c9fc91
diff --git a/private/compat/27.0/27.0.ignore.cil b/private/compat/27.0/27.0.ignore.cil
index 64ec724..31d08e9 100644
--- a/private/compat/27.0/27.0.ignore.cil
+++ b/private/compat/27.0/27.0.ignore.cil
@@ -54,6 +54,7 @@
     lowpan_prop
     lowpan_service
     mediaextractor_update_service
+    metadata_file
     mnt_vendor_file
     network_watchlist_data_file
     network_watchlist_service