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/embest/mx6boards/mx6boards.c b/board/embest/mx6boards/mx6boards.c
index bcfe125..bf5c020 100644
--- a/board/embest/mx6boards/mx6boards.c
+++ b/board/embest/mx6boards/mx6boards.c
@@ -12,6 +12,7 @@
  * Copyright (C) 2013 Jon Nettleton <jon.nettleton@gmail.com>.
  */
 
+#include <init.h>
 #include <asm/arch/clock.h>
 #include <asm/arch/sys_proto.h>
 #include <asm/arch/imx-regs.h>