video: backlight: da9052: Constify platform_device_id

The platform_device_id is not modified by the driver and core uses it as
const.

Signed-off-by: Krzysztof Kozlowski <k.kozlowski.k@gmail.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
diff --git a/drivers/video/backlight/da9052_bl.c b/drivers/video/backlight/da9052_bl.c
index b1943e7..fd2be41 100644
--- a/drivers/video/backlight/da9052_bl.c
+++ b/drivers/video/backlight/da9052_bl.c
@@ -152,7 +152,7 @@
 	return 0;
 }
 
-static struct platform_device_id da9052_wled_ids[] = {
+static const struct platform_device_id da9052_wled_ids[] = {
 	{
 		.name		= "da9052-wled1",
 		.driver_data	= DA9052_TYPE_WLED1,