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/syteco/zmx25/zmx25.c b/board/syteco/zmx25/zmx25.c
index 9ea62bb..d5393d7 100644
--- a/board/syteco/zmx25/zmx25.c
+++ b/board/syteco/zmx25/zmx25.c
@@ -21,6 +21,7 @@
 #include <asm/io.h>
 #include <asm/arch/imx-regs.h>
 #include <asm/arch/iomux-mx25.h>
+#include <linux/delay.h>
 
 DECLARE_GLOBAL_DATA_PTR;