mtip32xx: remove the device_status debugfs file

This file is a huge mess that iterates over all devices and is in the
way of fixing the device removal in this driver, so remove it.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Link: https://lore.kernel.org/r/20220619060552.1850436-2-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>