staging/lustre/ldlm: const qualify struct lustre_handle * params

staging/lustre/ldlm: const qualify struct lustre_handle * params

Add a const qualifier to several struct lustre_handle * parameters in
the LDLM interface.

Signed-off-by: John L. Hammond <john.hammond@intel.com>
Reviewed-on: http://review.whamcloud.com/17071
Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-7403
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-by: James Simmons <uja.ornl@yahoo.com>
Signed-off-by: Oleg Drokin <green@linuxhacker.ru>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>