staging: lustre: lnet: Constify kernel_param_ops structure

The structure is used as an argument to module_param macro. This
macro calls a bunch of other macros and finally assigns the instance
of the kernel_param_ops structure to the const struct
kernel_param_ops* field of a variable of type kernel_param. Hence,
const can be added to the structure.

Coccinelle Script:

@r disable optional_qualifier@
identifier i;
position p;
@@
static struct kernel_param_ops i@p = { ... };

@ok1@
identifier r.i;
expression e;
position p;
@@
e = i@p

@script:python s@
i << r.i;
t;
@@
coccinelle.t = i[10:];

@ok2@
declarer name module_param;
expression e1,e2;
position p;
@@
module_param(e1,s.t@p,e2);

@bad@
position p != {r.p,ok1.p,ok2.p};
identifier r.i;
@@
e@i@p

@depends on !bad disable optional_qualifier@
identifier r.i;
@@
static
+const
struct kernel_param_ops i = { ... };

Signed-off-by: Gargi Sharma <gs051095@gmail.com>
Reviewed-by: James Simmons <jsimmons@infradead.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>