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/sandbox/sandbox.c b/board/sandbox/sandbox.c
index 438f9a4..0c3d245 100644
--- a/board/sandbox/sandbox.c
+++ b/board/sandbox/sandbox.c
@@ -7,6 +7,7 @@
 #include <cpu_func.h>
 #include <cros_ec.h>
 #include <dm.h>
+#include <init.h>
 #include <led.h>
 #include <os.h>
 #include <asm/test.h>