Partially revert "sepolicy: update for Android 10"

This partially reverts 8b85264baf8a4f23df829b25de38ef4e3f96df9f

/persist is labelled as persist_file again to avoid changing security
contexts of existing files.

Issue: FP2A10-150
Change-Id: I3b0dcd1158d9f670158b0d8927371192208fa50f
diff --git a/sepolicy/hiccup.te b/sepolicy/hiccup.te
index 8845ea4..a3ce3a6 100644
--- a/sepolicy/hiccup.te
+++ b/sepolicy/hiccup.te
@@ -31,8 +31,8 @@
 get_prop(hiccup_app, hiccup_prop)
 
 # Allow hiccup_app to read files in /persist
-allow hiccup_app mnt_vendor_file:dir r_dir_perms;
-allow hiccup_app mnt_vendor_file:file r_file_perms;
+allow hiccup_app persist_file:dir r_dir_perms;
+allow hiccup_app persist_file:file r_file_perms;
 
 # Allow hiccup_app to detect if the last shutdown was clean
 get_prop(hiccup_app, shutdown_reason_prop)