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/ti/am57xx/board.c b/board/ti/am57xx/board.c
index 8d1f389..c755821 100644
--- a/board/ti/am57xx/board.c
+++ b/board/ti/am57xx/board.c
@@ -9,6 +9,7 @@
 
 #include <common.h>
 #include <env.h>
+#include <init.h>
 #include <palmas.h>
 #include <sata.h>
 #include <serial.h>