Merge "Update overlayfs patch series reference"

- Kernel must have CONFIG_OVERLAY_FS=y and will need to be patched

  with "*overlayfs: override_creds=off option bypass creator_cred*"

  if kernel is 4.4 or higher.

  The patch is available on the upstream mailing list and the latest as of

  Feb 8 2019 is https://lore.kernel.org/patchwork/patch/1009299/.

  The patch series is available on the upstream mailing list and the latest as

  of Jul 24 2019 is https://lore.kernel.org/patchwork/patch/1104577/.

  This patch adds an override_creds _mount_ option to overlayfs that

  permits legacy behavior for systems that do not have overlapping

  sepolicy rules, principals of least privilege, which is how Android behaves.