loop: stop using loop_reconfigure_limits in __loop_clr_fd

loop: stop using loop_reconfigure_limits in __loop_clr_fd

__loop_clr_fd wants to clear all settings on the device.  Prepare for
moving more settings into the block limits by open coding
loop_reconfigure_limits.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Damien Le Moal <dlemoal@kernel.org>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Link: https://lore.kernel.org/r/20240617060532.127975-5-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>