LU-18923 osd: move simple debugfs files to sysfs

LU-18923 osd: move simple debugfs files to sysfs

Move simple files in debugfs for osd backends to general sysfs.
This makes them available as non-root.

Change-Id: If7a33b8a53c712a46735981653d86bdd2c9775a6
Signed-off-by: James Simmons <jsimmons@infradead.org>
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/58805
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Oleg Drokin <green@whamcloud.com>