platform-drivers-x86: set backlight type to BACKLIGHT_PLATFORM

Some newly added drivers do not set backlight type, as a result
/sys/class/backlight/<backlight>/type shows incorrect backlight type.

Signed-off-by: Axel Lin <[e-mail]>
Cc: Corentin Chary <[e-mail]>
Cc: Yin Kangkai <[e-mail]>
Signed-off-by: Matthew Garrett <[e-mail]>

drivers/platform/x86/asus-wmi.c

···
 		return power;
 
 	memset(&props, 0, sizeof(struct backlight_properties));
+	props.type = BACKLIGHT_PLATFORM;
 	props.max_brightness = max;
 	bd = backlight_device_register(asus->driver->name,
 				       &asus->platform_device->dev, asus,

drivers/platform/x86/intel_oaktrail.c

···
 	struct backlight_properties props;
 
 	memset(&props, 0, sizeof(struct backlight_properties));
+	props.type = BACKLIGHT_PLATFORM;
 	props.max_brightness = OT_EC_BL_BRIGHTNESS_MAX;
 	bd = backlight_device_register(DRIVER_NAME,
 				       &oaktrail_device->dev, NULL,