LU-8066 ldlm: move debugfs entries to general sysfs

LU-8066 ldlm: move debugfs entries to general sysfs

Any simple debugfs files in the top ldlm directory should be
moved to /sys/fs/lustre/ldlm. This ensures these files will
always be available which is not the case for debugfs.

Change-Id: I851923894d8b6c594056d71a891364d5f54988a1
Signed-off-by: James Simmons <jsimmons@infradead.org>
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/58087
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Shaun Tancheff <shaun.tancheff@hpe.com>
Reviewed-by: Timothy Day <timday@amazon.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>