exynos: Disable LCD display for boards we can't convert

Some boards have the LCD enabled but I cannot test operation for the driver
model conversion. Disable the LCD on these to avoid build errors.

Signed-off-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>
diff --git a/board/samsung/trats/trats.c b/board/samsung/trats/trats.c
index 54d01ec..66a54d4 100644
--- a/board/samsung/trats/trats.c
+++ b/board/samsung/trats/trats.c
@@ -596,6 +596,7 @@
 	return 0;
 }
 
+#ifdef CONFIG_LCD
 void exynos_lcd_misc_init(vidinfo_t *vid)
 {
 #ifdef CONFIG_TIZEN
@@ -606,3 +607,4 @@
 	setenv("lcdinfo", "lcd=s6e8ax0");
 #endif
 }
+#endif