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/common/autoboot.c b/common/autoboot.c
index 9d7b6b8..6d78716 100644
--- a/common/autoboot.c
+++ b/common/autoboot.c
@@ -19,6 +19,7 @@
 #include <menu.h>
 #include <post.h>
 #include <time.h>
+#include <linux/delay.h>
 #include <u-boot/sha256.h>
 #include <bootcount.h>