remove arch/sh

[Christoph Hellwig]

On Mon, Jan 16, 2023 at 09:52:10AM +0100, John Paul Adrian Glaubitz wrote:
> We have had a discussion between multiple people invested in the SuperH port and
> I have decided to volunteer as a co-maintainer of the port to support Rich Felker
> when he isn't available.

So, this still isn't reflected in MAINTAINERS in linux-next.  When
do you plan to take over?  What platforms will remain supported and
what can we start dropping due to being unused and unmaintained?