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/common/splash.c b/common/splash.c
index 98f0089..0e520cc 100644
--- a/common/splash.c
+++ b/common/splash.c
@@ -21,6 +21,7 @@
  */
 
 #include <common.h>
+#include <display_options.h>
 #include <env.h>
 #include <splash.h>
 #include <lcd.h>