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/b4860qds/b4860qds.c b/board/freescale/b4860qds/b4860qds.c
index eed379a..e10f948 100644
--- a/board/freescale/b4860qds/b4860qds.c
+++ b/board/freescale/b4860qds/b4860qds.c
@@ -16,6 +16,7 @@
 #include <linux/compiler.h>
 #include <asm/mmu.h>
 #include <asm/processor.h>
+#include <linux/delay.h>
 #include <linux/errno.h>
 #include <asm/cache.h>
 #include <asm/immap_85xx.h>