Add seal if ashmem-dev is backed by memfd am: 61a2897733 am: 7878e7c9b7 am: fb73f1789e am: 170c133259 am: 72add75484 am: 87675df8a6 am: 4281014b85 am: 796996fa39 am: 3046d6aeea

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

Change-Id: Idf3c3f3212e9bf806fd718b1bad6117f8df57a13
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>