sandbox: implement ft_board_setup()

Currently we are not able to test reservations created by ft_board_setup().

Implement ft_board_setup() to create an arbitrary reservation and enable
OF_BOARD_SETUP.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Reviewed-by: Simon Glass <sjg@chromum.org>
diff --git a/board/sandbox/sandbox.c b/board/sandbox/sandbox.c
index 0c3d245..1372003 100644
--- a/board/sandbox/sandbox.c
+++ b/board/sandbox/sandbox.c
@@ -58,6 +58,12 @@
 	return 0;
 }
 
+int ft_board_setup(void *fdt, bd_t *bd)
+{
+	/* Create an arbitrary reservation to allow testing OF_BOARD_SETUP.*/
+	return fdt_add_mem_rsv(fdt, 0x00d02000, 0x4000);
+}
+
 #ifdef CONFIG_BOARD_LATE_INIT
 int board_late_init(void)
 {