platform/x86: dell-rbtn: constify rfkill_ops structures

Add const to rfkill_ops structures that are only passed as an argument
to the functions rfkill_alloc or samsung_new_rfkill. These arguments are
of type const, so such structures can be annotated with const.
Signed-off-by: NBhumika Goyal <bhumirks@gmail.com>
Signed-off-by: NAndy Shevchenko <andriy.shevchenko@linux.intel.com>

drivers/platform/x86/dell-rbtn.c

@@ -110,7 +110,7 @@ static int rbtn_rfkill_set_block(void *data, bool blocked)
 	return -EINVAL;
 }
 
-static struct rfkill_ops rbtn_ops = {
+static const struct rfkill_ops rbtn_ops = {
 	.query = rbtn_rfkill_query,
 	.set_block = rbtn_rfkill_set_block,
 };