Add seal if ashmem-dev is backed by memfd am: 61a2897733

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

Change-Id: I816da3ae81e4eaa4ae120849b57e9685ef8e49de
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>