common: Drop linux/delay.h from common header

Move this uncommon header out of the common header.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/video/am335x-fb.c b/drivers/video/am335x-fb.c
index b1e67cc..2707ff5 100644
--- a/drivers/video/am335x-fb.c
+++ b/drivers/video/am335x-fb.c
@@ -22,6 +22,7 @@
 #include <asm/arch/sys_proto.h>
 #include <asm/io.h>
 #include <asm/utils.h>
+#include <linux/delay.h>
 #include <linux/err.h>
 #include "am335x-fb.h"