Merge "libc++fs is part of libc++ now." into main am: ef376ed30d am: 4fb42491ae

Original change: https://android-review.googlesource.com/c/platform/frameworks/av/+/3315774

Change-Id: Idaf030658d5b8e6c164392b46b070ed86ed0a664
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>