sandbox: Correct operaion of 'reset' command

Currently 'reset' only works with the test device tree. When run without a
device tree, or with the normal device tree, the following error is
displayed:

   Reset not supported on this platform

Fix the driver and the standard device tree to avoid this.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reported-by: Stephen Warren <swarren@nvidia.com>
Tested-by: Stephen Warren <swarren@wwwdotorg.org>
diff --git a/drivers/misc/reset_sandbox.c b/drivers/misc/reset_sandbox.c
index 917121b..2691bb0 100644
--- a/drivers/misc/reset_sandbox.c
+++ b/drivers/misc/reset_sandbox.c
@@ -40,7 +40,7 @@
 	 * (see the U_BOOT_DEVICE() declaration below) should not do anything.
 	 * If we are that device, return an error.
 	 */
-	if (gd->fdt_blob && dev->of_offset == -1)
+	if (state->fdt_fname && dev->of_offset == -1)
 		return -ENODEV;
 
 	switch (type) {