block: move disk_{block,unblock,flush}_events to blk.h

No need to have these declarations in a public header.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Link: https://lore.kernel.org/r/20220124093913.742411-2-hch@lst.deSigned-off-by: Jens Axboe <axboe@kernel.dk>

block/blk.h

@@ -445,6 +445,9 @@ int disk_alloc_events(struct gendisk *disk);
 void disk_add_events(struct gendisk *disk);
 void disk_del_events(struct gendisk *disk);
 void disk_release_events(struct gendisk *disk);
+void disk_block_events(struct gendisk *disk);
+void disk_unblock_events(struct gendisk *disk);
+void disk_flush_events(struct gendisk *disk, unsigned int mask);
 extern struct device_attribute dev_attr_events;
 extern struct device_attribute dev_attr_events_async;
 extern struct device_attribute dev_attr_events_poll_msecs;

include/linux/genhd.h

@@ -185,9 +185,6 @@ static inline int bdev_read_only(struct block_device *bdev)
 	return bdev->bd_read_only || get_disk_ro(bdev->bd_disk);
 }
 
-extern void disk_block_events(struct gendisk *disk);
-extern void disk_unblock_events(struct gendisk *disk);
-extern void disk_flush_events(struct gendisk *disk, unsigned int mask);
 bool set_capacity_and_notify(struct gendisk *disk, sector_t size);
 bool disk_force_media_change(struct gendisk *disk, unsigned int events);