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/BuR/common/common.c b/board/BuR/common/common.c
index 7986bc8..3bc1d06 100644
--- a/board/BuR/common/common.c
+++ b/board/BuR/common/common.c
@@ -15,6 +15,7 @@
 #include <fdtdec.h>
 #include <i2c.h>
 #include <lcd.h>
+#include <linux/delay.h>
 #include "bur_common.h"
 
 DECLARE_GLOBAL_DATA_PTR;