SPDX: Convert all of our multiple 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 multiple licenses (in
these cases, dual license) declared in the SPDX-License-Identifier tag.
In this case we change from listing "LICENSE-A LICENSE-B" or "LICENSE-A
or LICENSE-B" or "(LICENSE-A OR LICENSE-B)" to "LICENSE-A OR LICENSE-B"
as per the Linux Kernel style document.  Note that parenthesis are
allowed so when they were used before we continue to use them.

Reviewed-by: Fabio Estevam <fabio.estevam@nxp.com>
Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/arch/arm/mach-stm32mp/include/mach/ddr.h b/arch/arm/mach-stm32mp/include/mach/ddr.h
index b635001..1857584 100644
--- a/arch/arm/mach-stm32mp/include/mach/ddr.h
+++ b/arch/arm/mach-stm32mp/include/mach/ddr.h
@@ -1,7 +1,6 @@
+/* SPDX-License-Identifier: GPL-2.0+ OR BSD-3-Clause */
 /*
  * Copyright (C) 2018, STMicroelectronics - All Rights Reserved
- *
- * SPDX-License-Identifier:	GPL-2.0+	BSD-3-Clause
  */
 
 #ifndef __MACH_STM32MP_DDR_H_
diff --git a/arch/arm/mach-stm32mp/include/mach/stm32.h b/arch/arm/mach-stm32mp/include/mach/stm32.h
index c7a2789..2090402 100644
--- a/arch/arm/mach-stm32mp/include/mach/stm32.h
+++ b/arch/arm/mach-stm32mp/include/mach/stm32.h
@@ -1,7 +1,6 @@
+/* SPDX-License-Identifier: GPL-2.0+ OR BSD-3-Clause */
 /*
  * Copyright (C) 2018, STMicroelectronics - All Rights Reserved
- *
- * SPDX-License-Identifier:	GPL-2.0+	BSD-3-Clause
  */
 
 #ifndef _MACH_STM32_H_
diff --git a/arch/arm/mach-stm32mp/include/mach/sys_proto.h b/arch/arm/mach-stm32mp/include/mach/sys_proto.h
index a8c20d1..41d4b40 100644
--- a/arch/arm/mach-stm32mp/include/mach/sys_proto.h
+++ b/arch/arm/mach-stm32mp/include/mach/sys_proto.h
@@ -1,7 +1,6 @@
+/* SPDX-License-Identifier: GPL-2.0+ OR BSD-3-Clause */
 /*
  * Copyright (C) 2015-2017, STMicroelectronics - All Rights Reserved
- *
- * SPDX-License-Identifier:	GPL-2.0+	BSD-3-Clause
  */
 
 #define CPU_STMP32MP15x	0x500