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/include/xyzModem.h b/include/xyzModem.h
index 6fae634..a8911b6 100644
--- a/include/xyzModem.h
+++ b/include/xyzModem.h
@@ -25,6 +25,8 @@
 #ifndef _XYZMODEM_H_
 #define _XYZMODEM_H_
 
+#include <linux/delay.h>
+
 #define xyzModem_xmodem 1
 #define xyzModem_ymodem 2
 /* Don't define this until the protocol support is in place */