LU-9855 obd: use ldo_process_config for mdc and osc layer

LU-9855 obd: use ldo_process_config for mdc and osc layer

Both the mdc and osc layer use the lu_device infrastructure but
we don't use ldo_process_config() which is preferred over the
currently used obd_process_config() handling. Migrate to the
lu_device ldo_process_config() for both mdc and osc layer.

Change-Id: I4d5e84c48377283148133e6338ef7257c44b89a3
Signed-off-by: James Simmons <uja.ornl@yahoo.com>
Reviewed-on: https://review.whamcloud.com/34106
Tested-by: Jenkins
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Ben Evans <bevans@cray.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>