[PATCH for 6.1/6.6] platform/loongarch: laptop: Fix build error due to backport

[Huacai Chen]

In 6.1/6.6 there is no BACKLIGHT_POWER_ON definition so a build error
occurs due to recently backport:

  CC      drivers/platform/loongarch/loongson-laptop.o
drivers/platform/loongarch/loongson-laptop.c: In function 'laptop_backlight_register':
drivers/platform/loongarch/loongson-laptop.c:428:23: error: 'BACKLIGHT_POWER_ON' undeclared (first use in this function)
  428 |         props.power = BACKLIGHT_POWER_ON;
      |                       ^~~~~~~~~~~~~~~~~~

Use FB_BLANK_UNBLANK instead which has the same meaning.

Signed-off-by: Huacai Chen <chenhuacai@xxxxxxxxxxx>
---
 drivers/platform/loongarch/loongson-laptop.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/platform/loongarch/loongson-laptop.c b/drivers/platform/loongarch/loongson-laptop.c
index 61b18ac206c9..5fcfa3a7970b 100644
--- a/drivers/platform/loongarch/loongson-laptop.c
+++ b/drivers/platform/loongarch/loongson-laptop.c
@@ -425,7 +425,7 @@ static int laptop_backlight_register(void)
 
 	props.max_brightness = status;
 	props.brightness = ec_get_brightness();
-	props.power = BACKLIGHT_POWER_ON;
+	props.power = FB_BLANK_UNBLANK;
 	props.type = BACKLIGHT_PLATFORM;
 
 	backlight_device_register("loongson_laptop",
-- 
2.47.1