Merge "libc++fs is part of libc++ now." into main am: 252f79488d am: cb83dc30c4

Original change: https://android-review.googlesource.com/c/platform/frameworks/av/+/3128535

Change-Id: I946f7f12e75364821cb6b4a49b1807091ab3084c
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>