SPDX: Convert all of our single license tags to Linux Kernel style

When U-Boot started using SPDX tags we were among the early adopters and
there weren't a lot of other examples to borrow from.  So we picked the
area of the file that usually had a full license text and replaced it
with an appropriate SPDX-License-Identifier: entry.  Since then, the
Linux Kernel has adopted SPDX tags and they place it as the very first
line in a file (except where shebangs are used, then it's second line)
and with slightly different comment styles than us.

In part due to community overlap, in part due to better tag visibility
and in part for other minor reasons, switch over to that style.

This commit changes all instances where we have a single declared
license in the tag as both the before and after are identical in tag
contents.  There's also a few places where I found we did not have a tag
and have introduced one.

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/arch/arm/mach-rockchip/rk3368/Makefile b/arch/arm/mach-rockchip/rk3368/Makefile
index 46798c2..3bddc10 100644
--- a/arch/arm/mach-rockchip/rk3368/Makefile
+++ b/arch/arm/mach-rockchip/rk3368/Makefile
@@ -1,8 +1,6 @@
+# SPDX-License-Identifier: GPL-2.0+
 #
 # Copyright (c) 2016 Andreas Färber
-#
-# SPDX-License-Identifier:	GPL-2.0+
-#
 obj-y		+= clk_rk3368.o
 obj-y		+= rk3368.o
 obj-y 		+= syscon_rk3368.o
diff --git a/arch/arm/mach-rockchip/rk3368/clk_rk3368.c b/arch/arm/mach-rockchip/rk3368/clk_rk3368.c
index 2f98165..722160d 100644
--- a/arch/arm/mach-rockchip/rk3368/clk_rk3368.c
+++ b/arch/arm/mach-rockchip/rk3368/clk_rk3368.c
@@ -1,7 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0+
 /*
  * Copyright (C) 2017 Rockchip Electronics Co., Ltd
  * Author: Andy Yan <andy.yan@rock-chips.org>
- * SPDX-License-Identifier:	GPL-2.0+
  */
 
 #include <common.h>
diff --git a/arch/arm/mach-rockchip/rk3368/rk3368.c b/arch/arm/mach-rockchip/rk3368/rk3368.c
index f62d91d..6d5d4cc 100644
--- a/arch/arm/mach-rockchip/rk3368/rk3368.c
+++ b/arch/arm/mach-rockchip/rk3368/rk3368.c
@@ -1,8 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0+
 /*
  * Copyright (c) 2016 Rockchip Electronics Co., Ltd
  * Copyright (c) 2016 Andreas Färber
- *
- * SPDX-License-Identifier:     GPL-2.0+
  */
 
 #include <common.h>
diff --git a/arch/arm/mach-rockchip/rk3368/syscon_rk3368.c b/arch/arm/mach-rockchip/rk3368/syscon_rk3368.c
index 99d51f0..c08ce43 100644
--- a/arch/arm/mach-rockchip/rk3368/syscon_rk3368.c
+++ b/arch/arm/mach-rockchip/rk3368/syscon_rk3368.c
@@ -1,9 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0+
 /*
  * (C) Copyright 2017 Rockchip Electronics Co., Ltd
  * Author: Andy Yan <andy.yan@rock-chips.com>
  * (C) Copyright 2017 Theobroma Systems Design und Consulting GmbH
- *
- * SPDX-License-Identifier:	GPL-2.0+
  */
 
 #include <common.h>
diff --git a/arch/arm/mach-rockchip/rk3368/u-boot-tpl.lds b/arch/arm/mach-rockchip/rk3368/u-boot-tpl.lds
index cc59844..7ba35b6 100644
--- a/arch/arm/mach-rockchip/rk3368/u-boot-tpl.lds
+++ b/arch/arm/mach-rockchip/rk3368/u-boot-tpl.lds
@@ -1,7 +1,6 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
 /*
  * (C) Copyright 2017 Theobroma Systems Design und Consulting GmbH
- *
- * SPDX-License-Identifier:	GPL-2.0+
  */
 
 #undef CONFIG_SPL_TEXT_BASE