camera.device@3.2 wrapper: Close release fence FDs

Freeing the native handle isn't enough; we need to close the fence FDs
after sending them to the camera service, since that's the behavior
that the legacy HAL interface requires.

Test: Camera CTS continues to pass.
Bug: 38482274
Change-Id: I879de566dcafecc1b899d79e68b38ea39b91a37e