sandbox: Correct header order in board file

Fix the header order in this file.

Change-Id: If98bd1d7175ba37c571b3da11e278462397e2421
Signed-off-by: Simon Glass <sjg@chromium.org>

board/sandbox/sandbox.c

diff --git a/board/sandbox/sandbox.c b/board/sandbox/sandbox.c
index 2e44bdf..e72d816 100644
--- a/board/sandbox/sandbox.c
+++ b/board/sandbox/sandbox.c
@@ -11,16 +11,16 @@
 #include <efi.h>
 #include <efi_loader.h>
 #include <env_internal.h>
+#include <extension_board.h>
 #include <init.h>
 #include <led.h>
+#include <malloc.h>
 #include <os.h>
 #include <asm/global_data.h>
 #include <asm/test.h>
 #include <asm/u-boot-sandbox.h>
 #include <linux/kernel.h>
-#include <malloc.h>
-
-#include <extension_board.h>
+#include <linux/sizes.h>
 
 /*
  * Pointer to initial global data area