fbdev: imx: 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: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Peng Fan <peng.fan@nxp.com>
Link: https://lore.kernel.org/r/20240424-video-backlight-lcd-ops-v2-17-1aaa82b07bc6@kernel.orgSigned-off-by: Lee Jones <lee@kernel.org>

drivers/video/fbdev/imxfb.c

@@ -857,7 +857,7 @@ static int imxfb_lcd_set_power(struct lcd_device *lcddev, int power)
 	return 0;
 }
 
-static struct lcd_ops imxfb_lcd_ops = {
+static const struct lcd_ops imxfb_lcd_ops = {
 	.check_fb	= imxfb_lcd_check_fb,
 	.get_contrast	= imxfb_lcd_get_contrast,
 	.set_contrast	= imxfb_lcd_set_contrast,