dt-bindings: reset: meson-axg: fix SPDX license id

As reported, the SPDX license id is not placed correctly and the variant
of the BSD License used should be specified.

Fixes: c1629257 ("dt-bindings: reset: Add bindings for the Meson-AXG SoC Reset Controller")
Reported-by: NThomas Gleixner <tglx@linutronix.de>
Signed-off-by: NJerome Brunet <jbrunet@baylibre.com>
Reviewed-by: NThomas Gleixner <tglx@linutronix.de>
Signed-off-by: NRob Herring <robh@kernel.org>

include/dt-bindings/reset/amlogic,meson-axg-reset.h

+/* SPDX-License-Identifier: GPL-2.0+ OR BSD-3-Clause */
 /*
- *
  * Copyright (c) 2016 BayLibre, SAS.
  * Author: Neil Armstrong <narmstrong@baylibre.com>
  *
  * Copyright (c) 2017 Amlogic, inc.
  * Author: Yixun Lan <yixun.lan@amlogic.com>
  *
- * SPDX-License-Identifier: (GPL-2.0+ OR BSD)
  */
 
 #ifndef _DT_BINDINGS_AMLOGIC_MESON_AXG_RESET_H