arm64: dts: ti: iot2050*: Clarify GPL-2.0 as GPL-2.0-only

SPDX identifier GPL-2.0 has been deprecated since license list version
3.0. Use GPL-2.0-only to be specific.

Cc: Chao Zeng <chao.zeng@siemens.com>
Cc: Jan Kiszka <jan.kiszka@siemens.com>
Cc: Le Jin <le.jin@siemens.com>
Acked-by: Jan Kiszka <jan.kiszka@siemens.com>
Acked-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Nishanth Menon <nm@ti.com>
Acked-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20240122145539.194512-16-nm@ti.comSigned-off-by: Vignesh Raghavendra <vigneshr@ti.com>

arch/arm64/boot/dts/ti/k3-am65-iot2050-common-pg1.dtsi

-// SPDX-License-Identifier: GPL-2.0
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * Copyright (c) Siemens AG, 2021-2023
  *

arch/arm64/boot/dts/ti/k3-am65-iot2050-common-pg2.dtsi

-// SPDX-License-Identifier: GPL-2.0
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * Copyright (c) Siemens AG, 2021
  *

arch/arm64/boot/dts/ti/k3-am65-iot2050-common.dtsi

-// SPDX-License-Identifier: GPL-2.0
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * Copyright (c) Siemens AG, 2018-2021
  *

arch/arm64/boot/dts/ti/k3-am6528-iot2050-basic-common.dtsi

-// SPDX-License-Identifier: GPL-2.0
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * Copyright (c) Siemens AG, 2018-2021
  *

arch/arm64/boot/dts/ti/k3-am6528-iot2050-basic-pg2.dts

-// SPDX-License-Identifier: GPL-2.0
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * Copyright (c) Siemens AG, 2018-2021
  *

arch/arm64/boot/dts/ti/k3-am6528-iot2050-basic.dts

-// SPDX-License-Identifier: GPL-2.0
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * Copyright (c) Siemens AG, 2018-2021
  *

arch/arm64/boot/dts/ti/k3-am6548-iot2050-advanced-common.dtsi

-// SPDX-License-Identifier: GPL-2.0
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * Copyright (c) Siemens AG, 2018-2021
  *

arch/arm64/boot/dts/ti/k3-am6548-iot2050-advanced-m2.dts

-// SPDX-License-Identifier: GPL-2.0
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * Copyright (c) Siemens AG, 2018-2023
  *

arch/arm64/boot/dts/ti/k3-am6548-iot2050-advanced-pg2.dts

-// SPDX-License-Identifier: GPL-2.0
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * Copyright (c) Siemens AG, 2018-2021
  *

arch/arm64/boot/dts/ti/k3-am6548-iot2050-advanced.dts

-// SPDX-License-Identifier: GPL-2.0
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * Copyright (c) Siemens AG, 2018-2021
  *