Merge "libc++fs is part of libc++ now." into main am: 984b51475b

Original change: https://android-review.googlesource.com/c/platform/packages/modules/NeuralNetworks/+/3128196

Change-Id: I8dcee10968618a3bf437a7bec06b234f2730a870
Signed-off-by: Automerger Merge Worker <[email protected]>