Add seal if ashmem-dev is backed by memfd am: 61a2897733 am: 7878e7c9b7 am: fb73f1789e am: 170c133259 am: 72add75484 am: 87675df8a6

Original change: https://googleplex-android-review.googlesource.com/c/platform/system/core/+/24776869

Change-Id: Ifce93a193d062ea6af1dd20bc18ecbc15f8cc6c2
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>