Merge "libc++fs is part of libc++ now." into main am: 0bdd9beefb am: 049d7fd21c

Original change: https://android-review.googlesource.com/c/platform/frameworks/native/+/3128253

Change-Id: I6cc629daaaaed08c7f05b6f20ca49bfff823b047
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>