Revert "block: freeze the queue earlier in del_gendisk"

Revert "block: freeze the queue earlier in del_gendisk"

This reverts commit 5cc4fcf3460a988ef2dddd5a002f4385d16b9b50.

Dusty Mabe reported consistent hang during CoreOS shutdown with a MD
RAID1 setup.  Although apparently similar hangs happened before,
and this patch most likely is not the root cause it made it much
more severe.  Revert it until we can figure out what is going on
with the md driver.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20220919144049.978907-1-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>