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

Add seal if ashmem-dev is backed by memfd am: 61a28977 am: 7878e7c9 am: fb73f178 am: 170c1332 am: 72add754

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



Change-Id: Ibc20777c221527cd61f0c005c5095c42c1ab5a40
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>