Add seal if ashmem-dev is backed by memfd am: 61a28977 am: 7878e7c9 am: fb73f178

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



Change-Id: Ieebb2b1f87aba8c1427cc4dfb112fe9f40e1956d
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>