backlight: hx8357: Constify lcd_ops

'struct lcd_ops' is not modified by core backlight code, so it can be
made const for increased code safety.
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org>
Link: https://lore.kernel.org/r/20240424-video-backlight-lcd-ops-v2-4-1aaa82b07bc6@kernel.orgSigned-off-by: Lee Jones <lee@kernel.org>

drivers/video/backlight/hx8357.c

@@ -559,7 +559,7 @@ static int hx8357_get_power(struct lcd_device *lcdev)
 	return lcd->state;
 }
 
-static struct lcd_ops hx8357_ops = {
+static const struct lcd_ops hx8357_ops = {
 	.set_power	= hx8357_set_power,
 	.get_power	= hx8357_get_power,
 };