Temporarily hide denial to fix tests.

This shoud be removed once the offending code is fixed.

Bug: 129298168
Test: Build.
Change-Id: Ie94a626be777a094fb587f72b3987994e085a23e
diff --git a/private/vold_prepare_subdirs.te b/private/vold_prepare_subdirs.te
index e6df48d..e7b6c5f 100644
--- a/private/vold_prepare_subdirs.te
+++ b/private/vold_prepare_subdirs.te
@@ -32,3 +32,6 @@
     system_data_file
     vold_data_file
 }:file { getattr unlink };
+
+# Temporarily block denials causing failing tests (b/129298168).
+dontaudit vold_prepare_subdirs domain:file read;