Revert "Revert "FROMLIST: overlayfs: internal getxattr operations without sepolicy checking""

This reverts commit d987f905 which was
reverting 4aa24aec.

All should be good now.

Cc: Mark Salyzyn <salyzyn@android.com>
Cc: kernel-team@android.com
Cc: Mark Salyzyn <salyzyn@google.com>
Bug: 133515582
Bug: 136124883
Bug: 129319403
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: Ic764d90114d41daf6defdbfbc4db43a8c224e6dc