freevxfs: remove the driver

freevxfs: remove the driver

Providing compatibility to various old-school Unix systems from the 1990s
was fun 25 years ago, but today it just attracts automated bug checkers
that have no point in something like this used for retro-computing.

As there as only one known users (and contributor) in the last 15 years,
drop it.  Anyone who needs to access such a file system can stay on an
older kernel, or maintain the code out of tree as it doesn't require
anything fancy.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://patch.msgid.link/20260729113643.2255419-2-hch@lst.de
Reviewed-by: "Darrick J. Wong" <djwong@kernel.org>
Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>