common: Move some board functions out of common.h

A number of board function belong in init.h with the others. Move them.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Tom Rini <trini@konsulko.com>
diff --git a/board/spear/x600/x600.c b/board/spear/x600/x600.c
index d6508ee..e1232ed 100644
--- a/board/spear/x600/x600.c
+++ b/board/spear/x600/x600.c
@@ -7,6 +7,7 @@
  */
 
 #include <common.h>
+#include <init.h>
 #include <micrel.h>
 #include <nand.h>
 #include <netdev.h>