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

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

Change-Id: Ibc20777c221527cd61f0c005c5095c42c1ab5a40
Signed-off-by: Automerger Merge Worker <[email protected]>