Merge "libc++fs is part of libc++ now." into main am: 5b7e5350a6 am: a82bd783ce

Original change: https://android-review.googlesource.com/c/platform/frameworks/native/+/3128499

Change-Id: I8d0fc048bf128d6fa486498d9dde64275ef71bc8
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>