block: deprecate autoloading based on dev_t

[ Upstream commit fbdee71b ]

Make the legacy dev_t based autoloading optional and add a deprecation
warning.  This kind of autoloading has ceased to be useful about 20 years
ago.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20220104071647.164918-1-hch@lst.de


Signed-off-by: Jens Axboe <axboe@kernel.dk>
Stable-dep-of: 457ef47c ("block: retry call probe after request_module in blk_request_module")
Signed-off-by: Sasha Levin <sashal@kernel.org>