All BCM5301X device DTS files use dual licensing. Try the same for SoC.
Introduce a new .dtsi file with a proper SPDX tag.
Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
Link: https://lore.kernel.org/r/20230503121611.1629-1-zajec5@gmail.comSigned-off-by: Florian Fainelli <f.fainelli@gmail.com>