sandbox: Audit config.h and common.h usage

Remove and replace common.h and config.h in sandbox when it's not needed
and add some explicit includes where needed.

Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/arch/sandbox/cpu/start.c b/arch/sandbox/cpu/start.c
index 2589c2e..dce8041 100644
--- a/arch/sandbox/cpu/start.c
+++ b/arch/sandbox/cpu/start.c
@@ -3,7 +3,7 @@
  * Copyright (c) 2011-2012 The Chromium OS Authors.
  */
 
-#include <common.h>
+#include <config.h>
 #include <cli.h>
 #include <command.h>
 #include <efi_loader.h>