LU-8066 osc: move complex proc to debugfs

LU-8066 osc: move complex proc to debugfs

Time to pull the trigger and move the complex proc files
to debugfs for the osc layer.

Change-Id: I719362a6885fd9272ad92249e089ed059dc734b5
Signed-off-by: James Simmons <jsimmons@infradead.org>
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/58090
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Shaun Tancheff <shaun.tancheff@hpe.com>
Reviewed-by: Arshad Hussain <arshad.hussain@aeoncomputing.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>