imx: mx6ul_14x14_evk: turn of backlight and LCD before booting OS

This should help keeping the screen black when booting the kernel.

Signed-off-by: Anatolij Gustschin <agust@denx.de>
Reported-by: Fabio Estevam <festevam@gmail.com>
Tested-by: Fabio Estevam <festevam@gmail.com>

board/freescale/mx6ul_14x14_evk/mx6ul_14x14_evk.c

@@ -384,6 +384,15 @@ int checkboard(void)
 	return 0;
 }
 
+/*
+ * Backlight off and reset LCD before OS handover
+ */
+void board_preboot_os(void)
+{
+	gpio_set_value(IMX_GPIO_NR(1, 8), 0);
+	gpio_set_value(IMX_GPIO_NR(5, 9), 0);
+}
+
 #ifdef CONFIG_SPL_BUILD
 #include <linux/libfdt.h>
 #include <spl.h>