common: Drop display_options.h from common header

Move this out of the common header and include it only where needed.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/board/freescale/ls1028a/ls1028a.c b/board/freescale/ls1028a/ls1028a.c
index 1a7806f..faecb60 100644
--- a/board/freescale/ls1028a/ls1028a.c
+++ b/board/freescale/ls1028a/ls1028a.c
@@ -4,6 +4,7 @@
  */
 
 #include <common.h>
+#include <display_options.h>
 #include <init.h>
 #include <malloc.h>
 #include <errno.h>