Consider adding an `aliases` node to RISC-V DTB that includes `serial0` alias
Additional information:
Example of an [aliases section for physical SoC](https://github.com/torvalds/linux/blob/b62cef9a5c673f1b8083159f5dc03c1c5daced2f/arch/riscv/boot/dts/sophgo/cv1800b-milkv-duo.dts#L14-L20).