colibri_imx7: wrap video specific funcs with ifdefs

Wrap video specific functionality with ifdefs.

Fixes: 195011b2("colibri-imx7: fix splash logo drawing")
Signed-off-by: NIgor Opaniuk <igor.opaniuk@toradex.com>

board/toradex/colibri_imx7/colibri_imx7.c

@@ -133,8 +133,10 @@ static int setup_lcd(void)
  */
 void board_preboot_os(void)
 {
+#ifdef CONFIG_DM_VIDEO
 	gpio_direction_output(GPIO_PWM_A, 1);
 	gpio_direction_output(GPIO_BL_ON, 0);
+#endif
 }
 
 static void setup_iomux_uart(void)