block: remove the struct blk_queue_ctx forward declaration

block: remove the struct blk_queue_ctx forward declaration

BugLink: https://bugs.launchpad.net/bugs/1990162
[ Upstream commit 9778ac77c2027827ffdbb33d3e936b3a0ae9f0f9 ]

This type doesn't exist at all, so no need to forward declare it.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Link: https://lore.kernel.org/r/20210920123328.1399408-12-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>