arm64: dts: sprd: move/add SPDX license to top of the file

arm64: dts: sprd: move/add SPDX license to top of the file

Checkpatch complains about the SPDX-License-Identifier being in the
wrong place. Move it to the top of the file to fix these warnings.
In cases of the license being specified only in text, convert these
to the SPDX-License-Identifier.

Reviewed-by: Baolin Wang <baolin.wang@linux.alibaba.com>
Signed-off-by: Stanislav Jakubek <stano.jakubek@gmail.com>
Link: https://lore.kernel.org/r/4d41caabb6af5741d92bd5567a04c93a18e2ebe2.1722842067.git.stano.jakubek@gmail.com
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>