Simply creating a file system on an skd device, followed by mount and
fstrim will result in errors in the logs, and even a BUG(). Let's
disable it. As far as I can tell, it hasn't worked right since it was
merged. Note that I've only disabled the reporting here, I haven't
removed the implementation bits in the code. Jens, let me know if you
want me to yank it out completely.