LU-8066 osc: migrate simple procfs files to sysfs

LU-8066 osc: migrate simple procfs files to sysfs

Move the remaining two simple procfs files for the osc layer
to sysfs.

Test-Parameters: trivial
Change-Id: Iafcc507cab9309f809f850d356c350c2b969241e
Signed-off-by: James Simmons <jsimmons@infradead.org>
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/57458
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Arshad Hussain <arshad.hussain@aeoncomputing.com>
Reviewed-by: Timothy Day <timday@amazon.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>