SPDX: Correct SPDX tags from recent xilinx merge

Correct the SPDX tag format.

Fixes: 3b52847a451a ("Merge tag 'xilinx-for-v2018.07' of git://www.denx.de/git/u-boot-microblaze")
Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/tools/zynqmpimage.h b/tools/zynqmpimage.h
index 7a57681..a1db819 100644
--- a/tools/zynqmpimage.h
+++ b/tools/zynqmpimage.h
@@ -1,9 +1,8 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
 /*
  * Copyright (C) 2016 Michal Simek <michals@xilinx.com>
  * Copyright (C) 2015 Nathan Rossi <nathan@nathanrossi.com>
  *
- * SPDX-License-Identifier:	GPL-2.0+
- *
  * The following Boot Header format/structures and values are defined in the
  * following documents:
  *   * ug1085 ZynqMP TRM doc v1.4 (Chapter 11, Table 11-4)