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/board/barco/platinum/platinum_titanium.c b/board/barco/platinum/platinum_titanium.c
index 5758c14..9f7c93b 100644
--- a/board/barco/platinum/platinum_titanium.c
+++ b/board/barco/platinum/platinum_titanium.c
@@ -12,6 +12,7 @@
 #include <asm/mach-imx/mxc_i2c.h>
 #include <miiphy.h>
 #include <micrel.h>
+#include <linux/delay.h>
 
 #include "platinum.h"