video: fbdev: imxfb: 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 <[e-mail]>
Signed-off-by: Tomi Valkeinen <[e-mail]>

drivers/video/fbdev/imxfb.c

···
 	struct regulator	*lcd_pwr;
 };
 
-static struct platform_device_id imxfb_devtype[] = {
+static const struct platform_device_id imxfb_devtype[] = {
 	{
 		.name = "imx1-fb",
 		.driver_data = IMX1_FB,