Merge "libc++fs is part of libc++ now." into main am: 7b155a8ac1 am: 5230c97512

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/3122731

Change-Id: Iecea9d926b4f9d9152e61953c0b08853f5bd1eb2
Signed-off-by: Automerger Merge Worker <[email protected]>