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/intel/cougarcanyon2/cougarcanyon2.c b/board/intel/cougarcanyon2/cougarcanyon2.c
index 7aadd9e..ce11eae 100644
--- a/board/intel/cougarcanyon2/cougarcanyon2.c
+++ b/board/intel/cougarcanyon2/cougarcanyon2.c
@@ -6,6 +6,7 @@
 #include <common.h>
 #include <dm.h>
 #include <errno.h>
+#include <init.h>
 #include <pci.h>
 #include <smsc_sio1007.h>
 #include <asm/ibmpc.h>