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

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

Change-Id: I9c9177c3c1ddd27739554384d2a81c2bf4857dcd
Signed-off-by: Automerger Merge Worker <[email protected]>