LU-18753 ptlrpc: remove ptlrpcd_add_rqset()

LU-18753 ptlrpc: remove ptlrpcd_add_rqset()

ptlrpcd_add_rqset() has no callers. Remove it.

Fixes: 03f537c50b76 ("LU-2244 lov: remove unused bits from lov, osc")
Test-Parameters: trivial
Signed-off-by: Timothy Day <timday@amazon.com>
Change-Id: Ica55c7559c0244af12bf1b47b350f8aeb0398f03
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/58225
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Aurelien Degremont <adegremont@nvidia.com>
Reviewed-by: Max Wang <wamax@amazon.com>
Reviewed-by: James Simmons <jsimmons@infradead.org>
Reviewed-by: Arshad Hussain <arshad.hussain@aeoncomputing.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>