Merge "Add explicit memfd support to MemoryHeapBase" am: 5eb0dcd92f am: 440c4434da am: 2b621d1f1b

Original change: https://android-review.googlesource.com/c/platform/frameworks/native/+/1851674

Change-Id: I55b257fd89cb9b8d197213eb0187760a223c4caf