Policy: file errors include files with attrs

Since many files can correspond to the same error, it can be hard to see
which file is causing the error for an attribute

Example, here I couldn't find which file was 'vendor_file':

  The following types on / must be associated with the "no_fs_type"
  attribute: vendor_file
   corresponding to files: /cache/overlay/oem/upper

Bug: 154851797
Test: see above example
Change-Id: Ic96536da3ce55ccc5f600579b9f6b1b4f56fc93d
1 file changed