thermal: ACPI: Constify acpi_thermal_zone_ops

Because thermal zone operations are now stored directly in struct
thermal_zone_device, acpi_thermal_zone_ops need not be modified by
the thermal core and so it can be const.

Adjust the code accordingly.

No functional impact.
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org>

drivers/acpi/thermal.c

@@ -620,7 +620,7 @@ acpi_thermal_unbind_cooling_device(struct thermal_zone_device *thermal,
 	return acpi_thermal_bind_unbind_cdev(thermal, cdev, false);
 }
 
-static struct thermal_zone_device_ops acpi_thermal_zone_ops = {
+static const struct thermal_zone_device_ops acpi_thermal_zone_ops = {
 	.bind = acpi_thermal_bind_cooling_device,
 	.unbind	= acpi_thermal_unbind_cooling_device,
 	.get_temp = thermal_get_temp,