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/freescale/m5249evb/m5249evb.c b/board/freescale/m5249evb/m5249evb.c
index da3adc5..a89d510 100644
--- a/board/freescale/m5249evb/m5249evb.c
+++ b/board/freescale/m5249evb/m5249evb.c
@@ -9,6 +9,7 @@
 #include <init.h>
 #include <malloc.h>
 #include <asm/immap.h>
+#include <linux/delay.h>
 
 DECLARE_GLOBAL_DATA_PTR;