backlight: platform_lcd: 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 <[e-mail]>
Reviewed-by: Daniel Thompson <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Lee Jones <[e-mail]>

drivers/video/backlight/platform_lcd.c

···
 	return plcd->us->parent == info->device;
 }
 
-static struct lcd_ops platform_lcd_ops = {
+static const struct lcd_ops platform_lcd_ops = {
 	.get_power	= platform_lcd_get_power,
 	.set_power	= platform_lcd_set_power,
 	.check_fb	= platform_lcd_match,