ACPI: constify ops structs

Structs battery_file, acpi_dock_ops, file_operations,
thermal_cooling_device_ops, thermal_zone_device_ops, kernel_param_ops
are not changed in runtime.  It is safe to make them const.
register_hotplug_dock_device() was altered to take const "ops" argument
to respect acpi_dock_ops' const notion.

Signed-off-by: Vasiliy Kulikov <segoon@openwall.com>
Acked-by: Jeff Garzik <jgarzik@redhat.com>
Signed-off-by: Len Brown <len.brown@intel.com>

drivers/acpi/sysfs.c

@@ -149,12 +149,12 @@ static int param_get_debug_level(char *buffer, const struct kernel_param *kp)
 	return result;
 }
 
-static struct kernel_param_ops param_ops_debug_layer = {
+static const struct kernel_param_ops param_ops_debug_layer = {
 	.set = param_set_uint,
 	.get = param_get_debug_layer,
 };
 
-static struct kernel_param_ops param_ops_debug_level = {
+static const struct kernel_param_ops param_ops_debug_level = {
 	.set = param_set_uint,
 	.get = param_get_debug_level,
 };