ANDROID: fuse-bpf: Move FUSE_RELEASE to correct place

The existing fuse-bpf freeing logic would free the fuse_file struct
immediately. However, this would break readahead. Move freeing logic
to the same place as done in classic fuse.

Bug: 286287652
Test: fuse_test passes, android boots, cts tests run
Change-Id: If13519f0e956a8da0dc98e7ac4aed2036070e969
Signed-off-by: Paul Lawrence <paullawrence@google.com>