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/d-link/dns325/dns325.c b/board/d-link/dns325/dns325.c
index dfdc683..a0f3dad 100644
--- a/board/d-link/dns325/dns325.c
+++ b/board/d-link/dns325/dns325.c
@@ -10,6 +10,7 @@
  */
 
 #include <common.h>
+#include <init.h>
 #include <miiphy.h>
 #include <net.h>
 #include <netdev.h>