There's no in-tree user anymore.  Let's get rid of it.
Signed-off-by: NNamhyung Kim <namhyung@kernel.org>
Signed-off-by: NPeter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20220908214104.3851807-3-namhyung@kernel.org