common: Drop init.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/bachmann/ot1200/ot1200_spl.c b/board/bachmann/ot1200/ot1200_spl.c
index a3a822f..7fbd6f2 100644
--- a/board/bachmann/ot1200/ot1200_spl.c
+++ b/board/bachmann/ot1200/ot1200_spl.c
@@ -4,6 +4,7 @@
  */
 
 #include <common.h>
+#include <init.h>
 #include <spl.h>
 #include <asm/arch/mx6-ddr.h>